Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2572f1508d7c8a…

MALICIOUS

PDF

48.1 KB Created: 2020-07-29 11:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72cb5017abc608b6858c503c2233440f SHA-1: e1e16a6468abc32f754a7d59991cfacf6eff1824 SHA-256: cf2572f1508d7c8a2f2a47fad0be98a01dde952e1198a8fb87ae99e66d0124ab
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded 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 infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, appears to be related to vocabulary, likely serving as a lure. The presence of multiple Shopify-hosted PDFs, while marked as benign, suggests an attempt to blend malicious links with seemingly legitimate content.

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=english+vocabulary+roots+prefixes+and+suffixes+pdf
    • http://files.worldiqchallenge.com/uploads/1/3/1/3/131379217/vajufudavukokav.pdf
    • http://files.playful-pedagogy.org/uploads/1/3/1/4/131409158/ce937fc.pdf
    • http://files.juliehui.co/uploads/1/3/2/6/132681452/bc5d8adb.pdf
    • http://files.playful-pedagogy.org/uploads/1/3/1/4/131409158/ce
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/nepefipojefozivin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/jusek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/38693458193.pdf
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/nejube.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/45365439672.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/nasabufeku.pdf
    • https://cdn.shopify.com/s/files/1/0439/1229/8648/files/95153306300.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/xoxumosonapubuzeraxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0301/files/sebozo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/vemavizuneruvivitudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/51749541377.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/15000286141.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_off00007db4.bin
f8ed530d061f0813d32cefa1cab7aeb6cc7a9bebcdb9a5f1b5afc1f0c4c010aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB4 5624 bytes
font_01_sfnt_off000090d1.bin
13c1cc7b657b57e3f6153e32cd45db84f936a3d1fd0ff430e5a52c1ef94da735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D1 9916 bytes

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