Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a91da42cb2d19be…

MALICIOUS

PDF

44.4 KB Created: 2020-08-26 13:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd483cc11c7a08e21080ca2504b2cd77 SHA-1: 1a44d673dade8adb0fa4240b641db435f1982593 SHA-256: 6a91da42cb2d19bec0fc860a68316ad0f2d7c1452d7d86b7d538741db8da7407
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL indicates an attempt to lead the user to a harmful 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=reheat+honey+baked+ham+turkey+breast
    • http://files.neplus.co/uploads/1/3/2/7/132740204/rakomuj.pdf
    • http://lomodi.marchdrumcorps.com/uploads/1/3/0/7/130776783/waxulutonefobedeza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/29236386296.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/56399925340.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3928/files/augusto_dos_anjos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/et_misericordia_magnificat_bach.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/15627933930.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/zagopula.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007019.bin
1ac96579524cc3aaeca6ec066990123f47b0c06ef4387101e61524a69fe417d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7019 5344 bytes
font_01_sfnt_off00008218.bin
78be34f9203764fce81a7545c474dac885d83c34bd2b7f2408ad80b5230e9b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8218 10196 bytes

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