Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f463c8fec048213…

MALICIOUS

PDF

68.4 KB Created: 2020-11-23 18:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94422e2fdb23d99645abd0b9bf9e1d8e SHA-1: 18d04171c47362ed26c07ec76fa49074bc37fe3e SHA-256: 4f463c8fec048213bc41893f8223204f5e9e16da7579fbb94ab3c88a8d534ed7
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL containing 'casino royale script'. The heuristic PDF_SEO_LINK_FARM indicates the PDF is part of a link farm, likely to increase its visibility and lure more victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=casino+royale+script
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f87d27addad0.pdf
    • https://cdn-cms.f-static.net/uploads/4415077/normal_5fa1c9e83ce6e.pdf
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5f90625a75177.pdf
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/mupufuvajinilub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e871e17-c7cc-4b8f-b372-cc5e69fda15b/zivojejiwodenibiko.pdf
    • https://uploads.strikinglycdn.com/files/30243b2a-3314-4846-a933-1f890848f116/peaceful_warrior_book.pdf
    • https://uploads.strikinglycdn.com/files/26daceb7-5e07-462e-bf24-345dcc94c528/guxuxerefe.pdf
    • https://uploads.strikinglycdn.com/files/fcd61507-3ccc-48a8-9510-325f52849a65/29366546011.pdf
    • https://uploads.strikinglycdn.com/files/7660f7f6-dfaf-4315-b4f8-f53ed2ca9906/life_cycle_of_an_elephant_for_kids.pdf
    • https://uploads.strikinglycdn.com/files/2f03eff1-47e2-4482-a780-0213c5266b63/56343139830.pdf
    • https://uploads.strikinglycdn.com/files/76487bcf-d9d7-48b5-9d61-9b4dd2b624cf/vefowoxifimaziwidavogar.pdf
    • https://uploads.strikinglycdn.com/files/3a508ebe-2abe-4740-bf70-d38e3425ab90/37920898106.pdf
    • https://uploads.strikinglycdn.com/files/9e99fd53-e873-4c7d-acac-3a12b4b1f097/54382314449.pdf
    • https://uploads.strikinglycdn.com/files/e39efc26-a042-4ad3-b655-25018ebad8c9/jeletekeputurewoxumejafi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee4.bin
dbbd88b526b56b78e161bf7e79f93afe0f95c35ed15c77020448e1125b5b662f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 4936 bytes
font_01_sfnt_off0000dfbf.bin
bc0dec7651432c628dbd45166a1e3757e800bd4868d467748cb60af29fc634fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 10940 bytes

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