The .cff fonts are compressed postscript standard fonts. They are used for PDFs without embedded fonts (which is legal for a lot of the PDF versions). So they are relevant for the muPDF engine, too.
Most probably, we can overcome this by creating proper CSS data and feeding that to CREngine.
My suggestion for now is to take the approach to change the CSS files. I'll have a look and try to come up with more sensible default, probably using the DroidFallback/DroidSans font.
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