Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b9c776acc75ca5…

MALICIOUS

PDF

48.3 KB Created: 2020-08-28 22:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa14c67a0cc4e91c3e791cdd6a33d917 SHA-1: 6cea0953197a1bac6bef5f03f904b9d43f7e982c SHA-256: 84b9c776acc75ca528b957bebd73808c72c0557e240c7c7c870a777386392715
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious infrastructure.

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.ru/wix?keyword=ninfa+sada+garza
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_846b09febf96493084f20af08920a2be.pdf
    • https://static.usrfiles.com/ugd/b8c837_8758fbd13a154e019d46c88081db4d8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_70a1ffe7f8bc4e2f9c2a1297548aa03e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6276d66f8341b9a030b75f3b7c5ef1.pdf
    • https://static.usrfiles.com/ugd/b8c837_994f6c6b3b334ceca66ad99599072445.pdf
    • https://static.usrfiles.com/ugd/b8c837_fde0e5f9ecf94f0f8fa19f126ef7d74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0893b9117fc24951aa6f7b0ce4139260.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ce0d02bfa7b458f835fcdb7f067e073.pdf
    • https://static.usrfiles.com/ugd/b8c837_13281f00f0d746fb824f14a438d82bfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_02ed8feb30ae41d4a319594468e12df3.pdf
    • https://static.usrfiles.com/ugd/b8c837_22a7c7319b0e456a8a00843f11f10d95.pdf
    • https://static.usrfiles.com/ugd/b8c837_a23b6ba8c2334f3d8b7f48d618d097d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_1638111e37bd4c80b3b30bbc8a6ccb82.pdf
    • https://static.usrfiles.com/ugd/b8c837_255cab9218ea446897b28ca64baf0d1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e41261e3f39d47ac8a0695c7094588b7.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_off00007c25.bin
24770bbc2795ac5367afa7c98a67bd5c4c2888a966bf2dc630adfd61bc0a337f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C25 5060 bytes
font_01_sfnt_off00008d70.bin
17efce03c80fb1bd424c6416d3a7b4f28e77bb59631bd2a0bd705e8bfa54a9ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D70 12088 bytes