The problem with that scenario is getting caught. Further to the east is safer for the perpetrators.
Several years ago I read some of Jack Cashill's work on this issue, and he seemingly identifies what sort of missile was fired at the aircraft.
If you have the resources of a wealthy Iranian family, you can get access to weapons that are not readily available to your ordinary run of the mill terrorist.
If you’re looking to do this sort of thing and you position yourself so far to the east to avoid getting caught, you might as well do it from the middle of the Atlantic Ocean.