The 38-year-old put Portugal ahead with a penalty before scoring his 127th international goal to make it 2-0.
The visitors scored all five goals before half-time, with Bruno Fernandes, Joao Cancelo and Joao Felix also netting in a dominant display.
The result means Portugal, who sealed qualification on Friday, stay top of Group J with a 100% record.
They have scored 32 goals and conceded just twice in their eight games so far, with Ronaldo netting nine in his seven appearances during the campaign.
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