Malicious PDF — malware analysis report

Static analysis result for SHA-256 a257b3ead601c83b…

MALICIOUS

PDF

38.8 KB Created: 2020-10-21 21:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8a8554263e3ddcae4f7ee39b2adb8c91 SHA-1: 8271990c0b2237aa64c2ab4c0f4530865f585859 SHA-256: a257b3ead601c83bdd48501d5b1347f6da445756a3e547bc4c5da50bcf2eccb7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, disguised with SEO-friendly keywords. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external PDF links, suggesting a link farm for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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/123?keyword=onshape+tutorial+pdf+espa%25C3%25B1ol In PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/paxowoti.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/nupularalurod.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/lodotos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f88311840dc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f870dbca26b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f8b8f111a882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8a79292ae87.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/6466ec6d-74aa-40fb-9e4a-543fd2d29221/witch_trainer_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7484cf14-adb1-4f33-bfbd-56bd9a55bd88/ronajasuxoxovoverebanasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b9d23c-d24e-4459-aada-ff23aef27b86/72588086397.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/39888949193.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/baeyer_villiger_rearrangement.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/2884355907.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/80832506991.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/wibewumev.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/13379249923.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/electrical_engineering_interview_questions_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/monitoring_and_evaluation_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/building_foundation_types.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_off000055e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55E3 5368 bytes
SHA-256: 744c67fb4880186dae82ed81bc34ccf3fb73c2ec645a51342b599a66d7e40e4e
font_01_sfnt_off000067db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67DB 10720 bytes
SHA-256: 0d7604b9885c33c0c0ef26e333381165a475eb3710bb976c4367057e5c6eb535

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