Malicious PDF — malware analysis report

Static analysis result for SHA-256 3310aebadf60265d…

MALICIOUS

PDF

53.0 KB Created: 2020-11-03 12:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9e26f36c9d42a7ccccfc3efd0307ab62 SHA-1: 3396788c8981d2f71ff379b6a20888304b88968a SHA-256: 3310aebadf60265d065fbc4ea7a343007b4b042553c8b9cd1b2b98457a9ffef1
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic. The presence of numerous external PDF links further supports the SEO link farm heuristic, indicating an attempt to distribute malicious content.

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/aws?keyword=epson+label+maker+manual+lw-400 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_5f97985c73134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_5f913382ad509.pdfIn PDF document text
    • https://morozosewiveloz.weebly.com/uploads/1/3/4/3/134387595/d367c.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/gevoderovepiru.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/50064b13-e58f-4be0-9050-49015e973a6b/jubidusonilujusiniz.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/gustavo_adolfo_becquer_los_ojos_verdes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1331b3-805c-406b-80c8-2dc07474d251/sazexisusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd4a954-baaa-4aab-87cf-4cae78761e21/kiwisa.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/gibipizegeborufovef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a602a1b-f5a3-4786-876d-d8b89e1f7188/30821126642.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/32468965709.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/kiragutufudaziwezorebowip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4c738a-ced7-46b4-b3b1-55c4224f2646/72840648147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258f713d-7e80-41f7-bf30-4672cd351acf/free_unblocked_online_multiplayer_games.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_off00008aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAE 5480 bytes
SHA-256: 5ee2022231f1bff4fcd5f9f87a6a14abe00e7ee43493f31240976f3cb5e4a961
font_01_sfnt_off00009d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D58 12476 bytes
SHA-256: fbf59e4ff4bebf5a5045f6147ee94a89bd17c83dc3ba720e21d6dc9525ee9c77

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