It's more likely a SAM brought down the plane than a bomb.
With bomb attack, that's explosion is going to cause explosive decompression within the cabin at 25k AGL. The plane will not come down in one giant piece (with only the wing detached) it will be blown outward and collapse inward and stressed the airframe and it will shatter into million little pieces, this is not how we saw in the video (assume the video is actually that plane gone down). On the other hand, a tactically deployed explosive device in the area if it is small enough, it could also detach the wing but run without blasting off the entire plane.
If it was missile, the missile will either go after a radar lock or IR lock, Embraer Legacy 600 have the engine right next to the wing, which is presumed missing in the downing. It would most likely where the missile is heading if it was a heat seeking missile. On the other hand, evidence that does not support this is, there are no missile vapour trail before/after the incident and there are no wreckage of missile found, missile don't ram their target, they use proximity fuze and explode next to their target, so the remaining of a missile would be found or at least seen if it was indeed a missile attack.
But all in all, I would put my money on a missile. Unless some new evidence came up,
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