Portugal regained the lead in the 86th minute through Cedric Soares' first senior global goal but Moreno's 91st minute header off the post ensured both nations shared the spoils. The player did not talk to reporters in Kazan.
It took a while for both sides to settle but the first real action of interest was possibly the most contentious.
Cristiano Ronaldo's initial shot hit the crossbar then Pepe "scored" from the rebound in the 22nd minute.
Ronaldo and his teammates can see the huge colorful depiction of the Portugal forward, but the public has no access to it.
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Having threatened with a header earlier, Hernandez stole in to head home an equaliser three minutes from the interval.
In the 42nd minute, after a missed clearance by Raphael Guerreiro, Carlos Vela calmly played a ball into the box where Chicharito Hernandez smashed a diving header into the back of the next.
But despite their bad tactical choices, Mexico fought back, winning a corner and converting from it in stoppage time.
Silva, who has just moved from FC Porto to AC Milan in a transfer worth almost 40 million euros, has scored seven goals in eight games since his debut with the national team in a friendly against Gibraltar in September.
'It was not the result we wanted, the team had nearly won and we suffered in the last minutes, but this is football, ' said Ronaldo, who is under more scrutiny than usual playing for his country after it emerged on Friday he wants to quit Real Madrid and leave Spain as a result of an investigation into his tax affairs. We know we still have lots of opportunities, there are two games remaining and that's why we're calm.
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"If we win we'll be close to qualifying so it's not the time to sound the alarm".
After pulling out a draw against the Portuguese, Mexico coach Juan Carlos Osorio said, "We were at least as good as they were and they're the current European champion".
"We also managed to keep Cristiano Ronaldo in check".
This was a match either could have won, but Mexico will be more pleased with the result than Portugal will be. "I arrived at a good point in time, when the team had just won the (European) title".
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