I making a copy of my wordpress  site to pubblish as static site on github

I use 
httrack -O /var/www/scritture/copia/      --update -c1 -a -p7 
<http://www.scritture.net/>

But there is a problem some URL are
<http://www.scritture.net/?download_ebook=y&booktype=pdf&id=30&ptype=post> 

This are URL of  pdf file auto generated from the site they are saved as 

index96f0.html

and the URL converted to:

<http://www.scritture.net/copia/www.scritture.net/index96f0.html?download_ebook=y&booktype=pdf&id=30&ptype=post>

But the browsers will open the page as html not as pdf

I wont the file as

index96f0.pdf

and the URL like

<http://www.scritture.net/index96f0.pdf>

Matteo