Hi there Nilbert!
This document/cartoon is a secondary source because it is most likely something someone drew after whatever event that took place and was not by someone involved in the event.
A primary source is a source created by the person/people involved in a historical event. This includes things like:
artifacts
documents
diaries
manuscripts
etc...
A secondary source is one that was created by somebody that was not involved in a historical event and are generally things like articles and textbooks.
-Your friend, ASIAX Frequent Answerer