Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deb8cf429e20249…

MALICIOUS

PDF

38.3 KB Created: 2020-08-19 12:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d63914a1d2c5c9fa8cce4118fa54a47 SHA-1: 7128fdca481406f62e64d81da27f200ebd29f5a8 SHA-256: 4deb8cf429e2024930abbccb84afa3d965bf0fc89988b4cbe0b758a78de74003
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/pify?keyword=osteoporosis+canada+vitamin+d+guidelines, which is likely used to funnel users to further malicious content. The document body, though heavily obfuscated, contains this URL and other embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/pify?keyword=osteoporosis+canada+vitamin+d+guidelines
    • http://files.aaron-delane.com/uploads/1/3/2/3/132303068/9254021.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/44325964746.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/ultratech_cement_manufacturing_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/exemple_attestation_d_hbergement_pour_visa_tudiant.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/airlines_manager_tycoon_2018_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/7682/6789/files/6699414574.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2965/files/understanding_calculus_problems_solutions_and_tips.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/bulletin_de_paie_explication.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_off0000583b.bin
29a7c03b59da2279b3135b2e547841c0647f2986e31e18980f524886b76581a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x583B 5480 bytes
font_01_sfnt_off00006ace.bin
6682cef4ef3608ba6b44fed340355d22eb41829842b5c26f000f28b701b31b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACE 10028 bytes

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