[Q] how to root samsung galaxy music duos GT S6012

i have just purchased a new Samsung galaxy music duos GT S6012
i want to root the phone , searched over the forum but could not root using any of the update files available. please help!!

phone info:
model No : GT S6012
Android Ver : 4.0.4
Kernel Version : 3.0.15-1178404
build number : IMM76D.S6012XWALL1