We need to combine: Smart TVs, Chromecasts and other devices are great for streaming content simply and quickly. But recently the hacker Giraffe saw in these devices an opportunity to promote the YouTuber PewDiePie as a way to draw users' attention to existing security breaches and intrusion risks.
This is not the first Giraffe invasion; it is the same person responsible for the attack that forced thousands of printers to print pages with the "sign up for PewDiePie" message. This time he has chosen to control smart TVs and the like to advertise the channel in question - not that YouTuber is in need of help, as his channel has approximately 79 millions of subscribers.
In the case of Chromecast, for example, the intrusion occurs as follows: a message is displayed to alert the user of what is happening: "your Chromecast / Smart TV is exposed to the public internet and is exposing sensitive information about you!". Then the message indicates a link that explains how users can protect themselves before showing a message suggesting that the user subscribe to the PewDiePie channel.
Giraffe directed its attacks on Chromecasts and smart TVs that used Shodan, a search engine for connected devices. So he looked for devices that had the 8008 and 8443 ports open, which are just the ones that allow the user to connect to the internet.