This morning, google.co.id was taken over, with the credit being taken by “Pakistani Hacker” Madleets, a serial website defacer.
Most likely, the attacker hasn't actually breached Google severs. Instead, he gained access to DNS servers and altered the records to ensure that all visitors of google.co.id would be redirected to his defacement page.
Their is not any specific reason mention behind this hack by hacker. But one thing is for sure that these kinds of cyber attacks really create huge questions for security experts. Google Indonesia still defaced at the time of news published.