A 'Free Kashmir' slogan, along with a Pakistani flag was seen on the homepage.
The hackers posted a message on the blog: "Our target is your government websites. We will never forget what you did against humanity..In Jammu and Kashmir, millions of people were dead. Indian forces killed Kashmir's families, killed innocent children. But no one cared !".
"Your bank accounts, credit cards, servers are in danger", the hackers warned further.
However, it seems all that the hackers wanted was to sent a message across.
At the end of the page, a line read, "Dear admins, we just wanted to publish this message. Muslims are not terrorists."
The blog was restored later in the day.
Mohanlal, who is a regular blogger, had voiced his support for Prime Minister Narendra Modi in one of the blog posts recently.
The social media also saw the lighter side of the hacking incident with netizens saying that they had foreseen this when PM Modi, in his US speech, mentioned Mahatma Gandhi's name as Mohanlal Karamchand Gandhi instead of Mohandas Karamchand Gandhi.
Modi had committed the same goof-up in his public addresses last year too.