Both sides had opportunities in the first period, but neither could make the breakthrough with the scores level at the interval.
The home side regained the lead moments later, however, when El-Arabi turned home from close range, before the forward scored his third after 77 minutes.
Read how it all unfolded in Sports Mole's minute-by-minute live commentary of the action below.
GRANADA: Roberto; Foulquier, Diakhate, Murillo, Angulo; Iturra, Yebda, Rico, Brahimi, Buonanotte; El Arabi
MALAGA: Caballero; Gamez, Sanchez, Angeleri, Antunes; Tissone, Darder; Fabrice, Portillo, Eliseu; Samuel