The 23-year-old grabbed a goal and an assist, and was named Man of the Match for the third time at the tournament.
It means the Elephants will now face Egypt in Agadir on Saturday evening, with both sides set to go head-to-head for a place in the semi-finals.
Latching onto a loose ball inside the area, Amad delicately dribbled his way through what looked to be a sea of players, before applying the finishing touch to notch the opener.
But the United winger wasn't done there, weaving through the Burkina Faso backline before teeing up Ousmane Diomande, who smashed home a second for the Elephants.