Malicious PDF — malware analysis report

Static analysis result for SHA-256 affd131d174a658b…

MALICIOUS

PDF

50.8 KB Created: 2020-08-03 03:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b008a4102e42ebe7ce394e4c9a722056 SHA-1: 4c271263fe762876f08dbaf6dbb9aee452bf401d SHA-256: affd131d174a658b48042c4e2768521456c6b3fd92f351f2d07f1b4ba20caf88
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains text related to 'student activities manual answers pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to trick users into downloading further malicious content. The presence of numerous embedded links, many pointing to Shopify domains, further supports the link farm heuristic.

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.cc/pify?keyword=exploraciones+student+activities+manual+answers+pdf
    • http://files.mccordchapman.com/uploads/1/3/1/0/131069869/gomeposebuza.pdf
    • http://files.pinewoodnaturopathic.com/uploads/1/3/0/7/130739621/dawimurazepob.pdf
    • http://files.plumasfiresafe.org/uploads/1/3/1/0/131070336/4c3ac64.pdf
    • http://files.harmonyinhogswamp.com/uploads/1/3/1/4/131406947/9c14b2c2e1d45.pdf
    • http://mefivulu.downtownsweet.com/uploads/1/3/0/7/130776265/dakigosodotir.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/pibufojaposinafora.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/sepexegipogulix.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/jeveg.pdf
    • https://cdn.shopify.com/s/files/1/0438/5262/8118/files/95549890666.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/23414748204.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/52111581193.pdf
    • https://cdn.shopify.com/s/files/1/0432/6693/2902/files/36397396300.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/jalasejuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/0119/0299/files/ximazupu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3107/5743/files/half_magic_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/88910740899.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/1651103171.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.

FilenameKindSourceSize
font_00_sfnt_off0000850e.bin
d6f41f2aee4f4807a1c6d08bb14204f69d20ce586a253547b84a0d2e93f8e116
pdf-font-stream PDF embedded font (sfnt) at offset 0x850E 5480 bytes
font_01_sfnt_off000097b4.bin
4b61c3d6a8f8bbf2afb612eb53193e742b38a7fa390b28e7e64aa1a2937f8cbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x97B4 11312 bytes