Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a99f579b2b44230…

MALICIOUS

PDF

80.8 KB Created: 2020-08-18 22:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7b3ff2cd34c84c9e60db562024ed11 SHA-1: 8e0fb35b8a29653d49d84a63679a5cd0c540194d SHA-256: 6a99f579b2b442300f95157f0521fc8e15512d08e8c4383ef8eb25f1f1e6f00a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=elliptic+curve+arithmetic+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector and other PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=elliptic+curve+arithmetic+pdf
    • http://fifiwuse.dirksalomon.de/uploads/1/3/2/6/132681477/luxivoloxigepej_ziwaxelug_muburozenogixek_jazikal.pdf
    • http://files.bokobowls.com/uploads/1/3/1/3/131379049/doremakifa.pdf
    • http://mijive.paulwilkinselectricien.com/uploads/1/3/1/3/131379295/xavirasolakilox.pdf
    • http://files.1686andco.com/uploads/1/3/1/4/131453793/tufiwikipuluzuza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mogapusezonoxifetomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/trigeminal_neuralgia_treatment_options.pdf
    • https://cdn.shopify.com/s/files/1/0431/0908/9447/files/93832688070.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/54153827004.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/bosubaxiwobumarut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8384/1190/files/lufodonemejitivapimuruj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/tikiwivowosopamulerevaxid.pdf
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/class_diagram_for_library_management_system.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da19.bin
c840a97b2c9002c6df0a51d05885d3ac9d456dbec2067e11f89b4305371d48d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 5236 bytes
font_01_sfnt_off0000ebcf.bin
b26af8eeac28081fbe0ee735f1cb7efc67766743851a6e7b35dedf415ede8f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 16764 bytes
font_02_sfnt_off00011fd9.bin
2ef574b91d421cb78bcaa27623ec04366e35faa6a631852c602942b36397ef52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 16468 bytes

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