.brf files are generated if the 'backref' or 'pagebackref' options of the hyperref package are enabled. These are intermediate files, so shouldn't be tracked.
@@ -7,6 +7,7 @@
*.blg
*-blx.aux
*-blx.bib
+*.brf
*.dvi
*.fdb_latexmk
*.fls
Niklas Rehfeld