Malicious PDF — malware analysis report

Static analysis result for SHA-256 50abf80ff3f89336…

MALICIOUS

PDF

71.0 KB Created: 2020-11-24 17:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 86bc102a7b69f283723d8f8e65ff0f9b SHA-1: 9d745a2a81b9df3efa11994a974cb84606449e6b SHA-256: 50abf80ff3f89336a230a77c6cc64429824bfe32b8ab9b0265cbf91341d2b869
222 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and ML classification, indicating malicious intent. The document contains a mass external PDF link farm, with the primary malicious URL being trafficked through a known redirector. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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?utm_term=tgi+fridays+unlimited+apps+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5fa3710843db9.pdfIn PDF document text
    • https://finijuzado.weebly.com/uploads/1/3/4/4/134444754/winexemi.pdfIn PDF document text
    • https://vavagufone.weebly.com/uploads/1/3/4/3/134345741/caf6bbbf.pdfIn PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/3213990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_5f9529295e57e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f927fb577740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f87e2289103e.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/a4d5135c-fed3-41ca-b9fb-b4ea91785579/cahier_de_vacances_6me_vers_5me_gratuit__imprimer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a94613-1642-44bb-a923-2f4bfa5c3862/29870248657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2624004-4107-4ed2-8471-32f92a052cdd/13133786873.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/why_do_cave_fish_lose_their_eyes_answer_key.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_off0000d4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E5 5476 bytes
SHA-256: c19e48c663763c54847e7236be584ee8457b316f83c002b8f496434dcbec158b
font_01_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 11456 bytes
SHA-256: b86b07db930d24820e9461834d6cae57ae6ab3a09f394e45633521f1b03df6df

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