Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b63482b8b78dd2…

MALICIOUS

PDF

84.1 KB Created: 2020-11-25 04:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 494ed770c162d56e492c3b191a6e5907 SHA-1: bc2742f3596afd033aa94bbb44bdaac94241a2ac SHA-256: 86b63482b8b78dd260bf4f89d3b9744b1b066951c59cba8954c4937acdf111c1
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary URL, 'https://traffnew.ru/strik?utm_term=contagion+video+assignment+part+1+answers', appears to be a lure, possibly related to phishing or malware distribution. No scripts were extracted, but the extensive linking pattern indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=contagion+video+assignment+part+1+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404292/normal_5fb600fe331bb.pdfIn PDF document text
    • https://ziwavolenexajid.weebly.com/uploads/1/3/4/5/134503628/72651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8b15735cd12.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/9f5b43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5fb8926c7e5f9.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/sokodivuniwa_gamirek_zerezodorukowo_gajib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_5fa1569cef509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fa0df5ea0831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f9a9f09ec61c.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/2640670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5f8a9e739ce6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f8867ea217b1.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/retobifulipo/anatomy_for_artists_barrington_barber.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_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 5356 bytes
SHA-256: 75e4544ddd33ab155cb1405eb429e82892163c45402dfdffe542eca02d04a2e1
font_01_sfnt_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 10964 bytes
SHA-256: 4fbd86520cc441b70603824734bcce288f675ed4445faa702c832889461ebaec

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