Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8400905ad02d15…

MALICIOUS

PDF

42.8 KB Created: 2020-11-07 19:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: eca79bbe8aacb580fc78ff861de1fc8c SHA-1: 3fb3e1f673e973b3394ac56955b6759405d10e0d SHA-256: cf8400905ad02d15ec45dc053ca1c455001a7e13ac93b417d5e89eddea61a51c
184 Risk Score

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://traffking.ru/aws?keyword=cover+letter+for+part+time+jobs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5f95bd1157ed3.pdfIn PDF document text
    • https://megoximigiwuboz.weebly.com/uploads/1/3/4/5/134579220/wanimiposegir-sijepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5fa3c078555ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/1457414643.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480383d1-e599-4288-a26c-7441284503c7/johnson_boat_motor_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/817d57b7-c44a-476c-984b-5eda658fc153/75227666508.pdfIn PDF document text
    • https://mefufigas.files.wordpress.com/2020/11/7301310382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f17c7e-ed11-44f3-b271-155e5db6d1e3/padajipemivo.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://jogivudewel.files.wordpress.com/2020/11/guduwelasosigenubabez.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_off00006b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 5228 bytes
SHA-256: c4a2c9562ae2a6263e53127470aa32d254384930dc6fd3bb5545d968fb5a0354
font_01_sfnt_off00007cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCA 9936 bytes
SHA-256: 1f1a61a62ea524f8f1465db29217f69f7b673328d30294ce9aca26d2f80f9aeb

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