According to Irfan Ahmed, an expert on Pakistani websites and web-servers, this defacement is due to change in DNS entries for 284
Defaced domains include Microsoft.PK, apple.PK, paypal.PK, ebay.PK, blogspot.PK, chrome.PK, Cisco.PK and others.
Apparently no one has claimed the responsibility for the incident, but a message appearing on defaced pages, including on Google.com.pk is displaying a message in Turkish language, hinting that the hacker could be Turkish in origin.
Hacker hasn’t left any message for anyone, unlike the norm that hackers follow to convey their message through such defacements.
However, there is a phrase saying “Downed Pakistan”, a sign of victory for hackers when the deface a website.