Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bb096544dc7d5f…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 11:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e45e249c683758cf758bf8c28b9dd4a SHA-1: 18c905ca6fa6f31548a79fdb971304dd9767dcbd SHA-256: f3bb096544dc7d5f8aa5bf01027231639091e5532a71142cdf4f44e1b2f5c7cd
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=minolta+srt+202+manual+pdf'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The presence of numerous other PDF links, many hosted on Shopify and static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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/wix?keyword=minolta+srt+202+manual+pdf
    • https://cdn.shopify.com/s/files/1/0465/1099/7654/files/king_architectural_metals_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0465/1499/5350/files/estacion_de_la_primavera_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/47159867736.pdf
    • https://cdn.shopify.com/s/files/1/0446/6769/9353/files/64170618182.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/tozelikelusizu.pdf
    • https://static.usrfiles.com/ugd/b8c837_720f27dbbeea4f4584d63ef9ccc4cf04.pdf
    • https://static.usrfiles.com/ugd/b8c837_717dc84d778946c8b63efb36bd22045a.pdf
    • https://static.usrfiles.com/ugd/4f270c_9c3ce4e31d2e4015b0e76e2239cea4da.pdf
    • https://static.usrfiles.com/ugd/7c3584_1b7f7482ebc04a1998c7a9329b3ea1d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://static.usrfiles.com/ugd/7c3584_c9099eebdbcd44db922ff1eeaab6237a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9010707b508d4fe29e5c843adfd177c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f1d29028b024ba9be7eda52858064b1.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_off00005342.bin
4caec053278a7089141b92ab0c757372e6bbf694bf081d6a4ebdcf56e2966504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5342 5468 bytes
font_01_sfnt_off000065bc.bin
5d7e72ba8a68abc7ac5133287c159eeb69d04790e4098f83672495da7535ddd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BC 10624 bytes

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