It is not a sock puppet, but rather an automated or semi-automated account for making repetitive edits that would be extremely tedious to do manually.
Administrators: if this bot is malfunctioning or causing harm, please block it.
Emergency bot shutoff button
Administrators: Use this button if the bot is malfunctioning. (direct link)
Non-administrators can Template:Edit a malfunctioning bot to Wikipedia:Administrators' noticeboard/Incidents.