Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4147def0795ffa…

MALICIOUS

PDF

40.3 KB Created: 2020-10-27 20:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 55630a43317ed181f6dcf873afc23e27 SHA-1: 262ed387437954e7c643afb29fea994b617fa516 SHA-256: 3b4147def0795ffa32b9a2aed67401a1114cd1a5b6182e53984dd455231120b3
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier also strongly indicated maliciousness. The primary malicious URL is https://cctraff.ru/strik?keyword=golf+in+the+year+2000+pdf, which is likely used to deliver a second-stage payload.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=golf+in+the+year+2000+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f8e6b8675cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f9015db33fa0.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/4703932.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/rebomedug/autonics_encoder.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/30112025624.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/gariwexobo.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/tratamento_cirrose_hepatica.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/54989920817.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/linorejupaleberotezaweder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9c74d3-1774-476e-8a63-f151b875931a/craft_cms_create_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1760d777-fa5c-4081-b852-3fe3168dcfa3/68530988860.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/abused_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/alessandro_baricco_seda.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_off00005e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0A 5360 bytes
SHA-256: ef2cce3a5b7e4eab4216e6ad0cc97fe8ef001c287d231fe39c9386a12c06d3f1
font_01_sfnt_off00007040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7040 10484 bytes
SHA-256: 8bc1ed4c8bdb7cf2cdee8c41143ff5b4d3aa04881f5435b7d5c4bd716b8fa5dd