Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc043ea0fd58c5f…

MALICIOUS

PDF

36.8 KB Created: 2020-11-08 08:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82259645614211ea807d88a88c7ed2d SHA-1: 599ce15c4998825b1610696b3ad1f00edebfb281 SHA-256: cdc043ea0fd58c5f5466b778676fb2f7a9ad9ac8f0ec96f497d1ffca724cd890
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. One of the primary external URLs identified is 'https://traffnew.ru/123?keyword=words+with+pedis', which is flagged as unknown reputation. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content or facilitate further compromise.

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://traffnew.ru/123?keyword=words+with+pedis
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5f9236921824d.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f9e808b18f72.pdf
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/sovilixuteki.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f9987dbd7fc5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/51b5f159-9cf1-4f3a-af88-c15f8fc66de9/washing_synthetic_dreads.pdf
    • https://uploads.strikinglycdn.com/files/2527bd1a-579e-40f0-884f-355fa3460db6/church_invite_letter_for_conference_sample.pdf
    • https://uploads.strikinglycdn.com/files/30d62992-6dfa-4f2e-bccd-88d9fa7d62cb/87563676319.pdf
    • https://uploads.strikinglycdn.com/files/cc8217b2-9d8b-4645-aff6-c2ac6a94fcc4/miercoles_en_ingles_como_se_pronuncia.pdf
    • https://uploads.strikinglycdn.com/files/dd2e183d-bb6f-4c4d-b3f3-6ce84fb265f1/95959905111.pdf
    • https://uploads.strikinglycdn.com/files/77d65bff-93b7-4d09-beca-ad70cc667c93/ejercicios_verbo_gustar.pdf
    • https://uploads.strikinglycdn.com/files/81262d56-7f46-4188-9c69-d5a18a63a0dc/70545893551.pdf
    • https://uploads.strikinglycdn.com/files/b8cc7925-7690-411c-82ba-38d85c5928da/spongebob_i_m_with_stupid.pdf
    • https://uploads.strikinglycdn.com/files/404532d4-b241-4871-a339-e19e00cf94e0/wow_macro_guide_2019.pdf
    • https://uploads.strikinglycdn.com/files/e5bdd545-0971-45b5-9f6c-c9e2081f6c5d/35451384384.pdf
    • https://s3.amazonaws.com/rovuweraja/12879996252.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_off00004fe2.bin
15ba28711cc6d9510cd8181abca17db6de1806a9e9cc2b27748a13073ee20364
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE2 4912 bytes
font_01_sfnt_off000060aa.bin
20cd368884a10929d4f69652770d0eb2bec8b4fbf911e990136d5567bf51a489
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 10892 bytes