Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e92ef6fbe573c9…

MALICIOUS

PDF

63.6 KB Created: 2020-11-25 16:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6c22d0225de28a29f0f5024a173c218d SHA-1: 25e1f3858467b9f99589810600814e2e32d9f870 SHA-256: 33e92ef6fbe573c9fbd8c8954d5685928b452f292cead8f033360248e2bd4915
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically 'ggtraff.ru', and also hosts a large number of external PDF links, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through a chain of redirects. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=sweet+cherry+wine+tabs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f9e39d6518ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5f98c97cdcceb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5fa8d96f72ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_5f995b272b5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fb3325feca22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_5fb3e542403e4.pdfIn PDF document text
    • https://dijaxoki.weebly.com/uploads/1/3/4/6/134666341/zozuk-lebagoraxaneba-xejizofit-tizamiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5faffd8285913.pdfIn PDF document text
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/915784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f9aeb5589154.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/706bd198-1003-43bf-8c4b-dde68858862b/17868263196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ea2bb0-7bd8-40b0-bd89-1ea37d79e51b/2006_pt_cruiser_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab6b517-5e61-464e-80ed-bbe1ead9ae29/m2n61-_ar_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6508df4-8c92-4b5d-8a78-bfbfe27e30f9/how_to_mirror_an_object_in_sketchup_2017.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_off0000b9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 5292 bytes
SHA-256: 14c9705228fa58601f9bfdfb518e61097827e4ab069c0893acb99f9c49521306
font_01_sfnt_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 11104 bytes
SHA-256: 69d07f61b90697b4820a2d15e9a27936bc8b3d70fb07b2caef33d13076672ecf

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