PDF malware analysis — malicious · af3aabf58f8ec002

MALICIOUS

PDF

50.9 KB Created: 2020-07-31 04:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c091c444969705be4f8d29233d6342a5 SHA-1: 00e2ee1771f0df093915bf419a4bdf5fa3a3e6dd SHA-256: af3aabf58f8ec002ac9d603c607fa27440f28c3b64479d77485b01ad9bcde888

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is part of a campaign to lure users with promises of free courses. The document body, though heavily obfuscated, contains text related to 'Curso de ingles em pdf gratis', reinforcing the lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.ru/pify?keyword=curso+de+ingles+em+pdf+gratis
- http://files.fincascoffee.com/uploads/1/3/2/8/132814958/4245484.pdf
- http://files.cmpellettdanceartist.com/uploads/1/3/0/7/130775195/7d484687d6.pdf
- http://files.wellesleyfitness.com/uploads/1/3/0/7/130776166/dfad38470.pdf
- http://files.friendsofkibbuse.org/uploads/1/3/1/4/131406780/c5bd82725e440c8.pdf
- http://files.wellesleyfitness.com/uploads/1/3/0/7/
- https://cdn.shopify.com/s/files/1/0440/3098/4357/files/nosuzabavobaginu.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
- https://cdn.shopify.com/s/files/1/0428/1086/7871/files/86813404630.pdf
- https://cdn.shopify.com/s/files/1/0437/1274/1529/files/64276201636.pdf
- https://cdn.shopify.com/s/files/1/0429/3305/9737/files/juwoginosapizajudoxenowo.pdf
- https://cdn.shopify.com/s/files/1/0431/6545/0391/files/zivazodipirenad.pdf
- https://cdn.shopify.com/s/files/1/0437/5340/6618/files/korobetifilikizut.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
- https://cdn.shopify.com/s/files/1/0437/6189/3534/files/60886859160.pdf
- https://cdn.shopify.com/s/files/1/0427/9179/6902/files/rixezokopuzizovima.pdf
- https://cdn.shopify.com/s/files/1/0433/5891/2662/files/66431959868.pdf
- https://cdn.shopify.com/s/files/1/0429/2935/6959/files/20017216984.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000087c3.bin` `ef66daf0d89399ffa253e8e7bf49e5913fc04992339ee1f496b1031448f5bbec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x87C3	5268 bytes
`font_01_sfnt_off00009995.bin` `20728d2ee3f75703e0b93f403fa5dc15228043ac0b1a961fd0090293ee3d87c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9995	10912 bytes

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