Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31419886c7281db…

MALICIOUS

PDF

53.0 KB Created: 2020-08-22 00:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b104118df028cc0c3ab0bee2efa8040f SHA-1: e4dbc509009b8b406598021816ad327405a35bd3 SHA-256: d31419886c7281db6b2444d745a9a790b34becdfda7f9c1b8110fbfc7494325f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel users to a phishing or malware distribution site.

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=verbos+uniformes+biformes+e+triformes+em+ingles
    • http://files.lightthestage.ca/uploads/1/3/1/1/131164375/zisokalure.pdf
    • http://giripa.logicalprepping.com/uploads/1/3/2/3/132302870/menofasoroti.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/appraisal_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/check_domain_name_registration_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/valurosumuvamimofif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/ffmpeg_encoding_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/bazumadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/43976690080.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4685/files/78192612748.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/nisokaruw.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/tomubirapexuperoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2823/files/disefuxew.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_off0000853a.bin
d7aff68920cd26310c31b5c1c2259e3dee07635afaf92f0bfdaa7e53d812f279		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853A 4980 bytes
font_01_sfnt_off0000961b.bin
405608fe1ad93226bd500063d9f2c05f9a339d245ea5a6d039d24798aac81ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961B 16140 bytes

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