Internet Explorer supports a particular type of format called Embedded OpenType that provides some control over where and how the font is allowed to be embedded. You'll need to convert your TTF into an EOT format. Microsoft provides a tool called WEFT but it is ancient and I'll be damned if I can get it working. Thankfully, there is a command line tool called TTF2EOT that can convert your font.
Also, I converted the font in full from TTF and the SVG ended up half the size of its TTF counterpart. I guess this could be coincidental and specific to that font. Either way, I would not recommend anyone to use the fonts without first optimizing them, of course.