Now that browsing the internet via a mobile device has become a norm, malware has also followed in that path. Lookout Mobile Security discovered some websites that have been designed in such a way that they only attack and infect Android devices on which the pages are loaded on. The websites which have not been identified publicly yet, operate as "drive-by malware vectors" and if an Android device visits the webpage knowingly or otherwise without being fully patched up, the alleged malware will automatically install itself onto your device unbeknownst to the user.
Ubergizmo, First Drive-By Malware Sites Discovered for Android