Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0b19d20091af72…

MALICIOUS

PDF

41.3 KB Created: 2020-09-03 08:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00029c2dca6dc355c7d2cc50ac606b6f SHA-1: 88a08045891cc1d683251dca1d8c8807d417a652 SHA-256: 8c0b19d20091af7296e9928a9f40b913933cc56bd14e9ac86198dcc65d276d66
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.me' with a keyword related to a popular game. The document body, though heavily obfuscated, also contains this URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com' and 'cdn.shopify.com', likely to improve search engine ranking for the lure. The primary malicious IOC is the redirector URL, which is designed to lead users to potentially harmful content.

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.me/wix?keyword=candy+crush+saga+apk+ios
    • https://static.usrfiles.com/ugd/18ee90_9f0bdafdb4564558a8c57046f81dad9c.pdf
    • https://static.usrfiles.com/ugd/fbccce_6159cb46d68c48deb935a02b862caf82.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78055f4d46e43aabdc759bd590ecc76.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_f19aec490817413dab571c7a32fc9d97.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/2406900016.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/les_tubes_d_analyses_biologiques.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/72787607027.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/gusaneruruzor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2915/files/kiruna_guidetur_gruvan.pdf
    • https://static.usrfiles.com/ugd/b88e3d_d32aaf3cd3eb4f80b3b568d72fb6c589.pdf
    • https://static.usrfiles.com/ugd/b3bc21_78987f461be14cd28bfce4c6510b2f4d.pdf
    • https://static.usrfiles.com/ugd/368de4_7ea42cfc5d594049be9b31c6f4ec11e0.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/fowunegej.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/20594096828.pdf
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/wasp_factory.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_off000062f0.bin
e98883370a9e27c58521ef57da4d4f8511af5b051ca4acb3c8a1e8ed0e4e0743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 5372 bytes
font_01_sfnt_off00007539.bin
f3b2e9ef3ea9abc8361e92a5dcc6f45a537b442ad709a721f878ab7745ffc213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 10444 bytes

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