exactly meaning confirming your own account being Hijacked, it wouldn't be too hard to have them put the confirm for credit card and at the same time trojan you.
If you weren't buying gil to begin with then it wouldn't of happened so yes it has everything to do with buying gil. I would say the chances of you not getting hacked are slim, because RMT they will snatch the account take your gil then sell it, then steal account take their gil sell it. that's how they operate.
