Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26604c598abd698…

MALICIOUS

PDF

55.8 KB Created: 2020-11-04 19:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d702122473bc383ddd05d3eaf0f9fbb SHA-1: 1790328d390bb2e7580710983ae5b0b0adacb9af SHA-256: b26604c598abd6982b3d8cd3a1188359cd45beaf2fac14a406b6a93aa1deb88e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://cctraff.ru/strik?keyword=trigon+teen+titans', is flagged as a known malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests an attempt to drive traffic 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://cctraff.ru/strik?keyword=trigon+teen+titans In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f895631c04cd.pdfIn PDF document text
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/8102645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f91917eeb51d.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/243a8c0dc6d5.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/pujenexajifav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9278809-0704-48f3-9de7-64f2667e07e7/8594222467.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/soccer_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/enumeration_of_microorganisms_in_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc8327b-e26f-40b4-bdd8-ace9cc41fd44/rofejegulamakodutitozunut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43f1720-9f7d-4466-a5b7-c4d946ccc56a/7179213241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1171f26e-7112-4c41-afb7-5a96e4fa90be/mina_bissell_ibioseminar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000997a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x997A 4772 bytes
SHA-256: 18839e92eabc20c945f0dbbc038038ce5c126738cf938ae6b6fc65b3b5ba6580
font_01_sfnt_off0000a9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C2 14456 bytes
SHA-256: 99576369681d8eefad846fbb3e20384201432c54e5bb4628619af0280369f5f3

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