Which raises the question as to whether 7.5 hours of fuel would be enough to reach Somalia at that sort of altitude (say about 5000 feet or lower)?
IF they were at 5k in an effort to dodge radar, as soon as they were a few hundred miles into the Indian Ocean, they could easily climb back to normal cruise altitudes to maximize the range with little risk of radar detection (assuming they continued to head away from land).
I keep thinking about that hostage/kidnapping scenario - if that was it, and it went well, I'd think that by now we would have heard something like a ransom demand.
Suppose it was intended to be a hostage/kidnapping scenario, but it went badly somehow. Perhaps dodging radar, etc. burned more fuel than anticipated and they ran out and crashed short of the destination, or there was an attempt to take the airplane back and it crashed (think United 93). Rather than admit their master plan had failed, have the would be terrorists/kidnappers instead stayed quiet and let the world wonder?