Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e774a950109483…

MALICIOUS

PDF

69.1 KB Created: 2020-11-07 16:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce7091bff568bcc4332addda2d59937b SHA-1: 79ba9b5a7e22b0d41dae593f9768d24e5ed732ae SHA-256: b4e774a95010948335279c51665854c66e1a0a8f2fe7441c86d858cbb11fcba7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristic analysis identified it as a redirector link and a link farm. The embedded URL `https://traffmen.ru/123?keyword=greater+slaying+arrow+pathfinder` is a primary indicator of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?keyword=greater+slaying+arrow+pathfinder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8abd3f1fe8a.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/6aff9c04156.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/f4323d91b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5f9947d4b4e9e.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/degogedego-dojidetudi-zuwixeva-wedupojopofege.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/gelitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386080/normal_5f94e8b0e7975.pdfIn PDF document text
    • https://jaxebenub.weebly.com/uploads/1/3/4/2/134266064/8165773d2c4904b.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/2114535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f8831ca91588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4bead7-e807-4efa-8a0a-e89deb20c62c/vepinumobejagud.pdfIn PDF document text
    • https://rosebuzi.files.wordpress.com/2020/11/modeling_and_simulation_of_aerospace_vehicle_dynamics_third_edition.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_off0000cf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 5528 bytes
SHA-256: b8a2c3ccbfcc424865371a6a3f07b5f7eb124c92e1e2c5fc60ce394765a34618
font_01_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10604 bytes
SHA-256: 27e5287fd83d506e993be215d47d6f3ea7c7a335d0ecc7d44bf33eabe7f73196

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