Aribo was on from start to finish as the Gers produced an outstanding second-half performance at the McDiarmid Park following a goalless first-half.
Goals from Alfredo Morelos, Connor Goldson and Jamie Defoe had given Rangers a 3-0 lead before the Nigeria international laid a last-minute assist for Defoe to bag his brace.
Moments before his assist in the encounter, the 23-year-old missed an opportunity to grab his second league goal of the season when his header hit the woodwork from close range in the 66th minute.
FULL-TIME: St Johnstone 0-4 Rangers— Rangers Football Club (@RangersFC) September 22, 2019
A brilliant second-half performance at McDiarmid Park. pic.twitter.com/FdFofKybfh
The victory moved Rangers level on points with Premiership leaders Celtic after securing 15 points in six league outings.
Aribo will be hoping to continue his good run when Steven Gerrard's men visit Livingston for a League Cup match on Wednesday.