I'd rank the possibilities as follows: 1) Publicity ploy by 8848 2) Some Baidu machines compromised by hackers were used for a DDOS attack 3) Low level Baidu tech does some freelancing 4) (highly improbable) Baidu management, having completed their IPO, turns their attention to DDOS attacks on minor competitors.
Good find, Tedster - it will be fascinating to see how this plays out. It might also be an interesting window on how the Chinese legal system resolves disputes between companies.
I've got to agree with Roger - seems extremely odd for Baidu's top management to do this and there are other scenarios that seem much more probable. Time will tell, I suppose. A very odd story, nonetheless.
Well, maybe a publicity ploy by 8848 is the answer as rogerd have thought.
In the justification, Baidu claimed that no evidence offered currently by 8848 could prove the attack is ascribed to Baidu. Objectively, there are some vicious network plugins that can disguise themselves as Baidu attacking 8848, hence occurred the possibilities of faked baidu attackers.