Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7383bc364408a7…

MALICIOUS

PDF

38.8 KB Created: 2020-11-08 09:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d6d6d0e419cf7e07dfeff9323d3b83f SHA-1: 9b28e874adc907ea9c3922614fe6cf1add9a9ce0 SHA-256: ae7383bc364408a75ebd95837da76f494c55bb0466d0c5574f94c83a2412a2cc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://trafffi.ru/123?keyword=milfast+industrial+supply. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=milfast+industrial+supply
    • https://kozesetod.weebly.com/uploads/1/3/4/5/134507136/3e11ac28270ad2.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f969e50dc1cd.pdf
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f88256bd172f.pdf
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5f96278100c98.pdf
    • https://cdn-cms.f-static.net/uploads/4383149/normal_5f8d0c9db1d04.pdf
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5f9f61b57bd6b.pdf
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/5426e4f5.pdf
    • https://suxaposalepet.weebly.com/uploads/1/3/4/6/134677753/3069193.pdf
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5fa026739045f.pdf
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/3371919.pdf
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/jexidabux.pdf
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5f9c604b7faae.pdf
    • https://cdn-cms.f-static.net/uploads/4418973/normal_5f99f46f47cc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/47b28e68-db7a-4104-ac6e-995b731786b1/6035325840.pdf
    • https://uploads.strikinglycdn.com/files/f1767f1f-9f8a-4be0-9652-309f760a78e2/upgrade_complete_notdoppler.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c54.bin
f576f440cab308357227f4c522820deb31d9cf574116fe29d90aa6dd93e570f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C54 4796 bytes
font_01_sfnt_off00005ca1.bin
e9c23221b775099b10630b030b53db6a63306e124de7af8fa48c0cc663e49132
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA1 10452 bytes
font_02_sfnt_off00008045.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 4324 bytes