Undesired download of Baidu Browser

new Android user with the world's most low end tablet, Azpen A727. I'm enjoying learning about Android and have killed off most of the bloatware...but twice now "Baidu Browser" has been downloaded without my request. I'm using the bloatware security app Lookout now. Is there a way to find out what is requesting these downloads, stop it, or block it? I'm open to using a different security app. Many thanks in advance.