Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d628aa52c4f4d4a…

MALICIOUS

PDF

65.7 KB Created: 2020-11-19 23:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcf35a2df3239067179c1ac65c23a970 SHA-1: d778665fdbea72bea6347a2ed191ae7bcca02bd4 SHA-256: 2d628aa52c4f4d4ae3d74d201464fd4810b3d5f9be33c63a34f0e7899a4e3fb7
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing and potential malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's content is designed to trick users into installing malicious software or extensions. The presence of links to known malicious redirectors like 'cctraff.ru' further supports this, as these are commonly used to host or redirect to malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/123?utm_term=avast+internet+security+key
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8735d15f7f4.pdf
    • https://gizojobov.weebly.com/uploads/1/3/4/4/134436228/nawenoj.pdf
    • https://cdn-cms.f-static.net/uploads/4412378/normal_5fb3033b1cf7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f0b44c8-bb47-41e2-905e-b1ec23f6e947/21048335979.pdf
    • https://uploads.strikinglycdn.com/files/57683565-4ab2-4806-a6be-fa4d60bbd23c/othello_emilia_quotes_analysis.pdf
    • https://uploads.strikinglycdn.com/files/e735a2d2-bb06-4e70-acf2-ed6a1d0bfa4d/autoperpetuacion_en_los_seres_vivos.pdf
    • https://uploads.strikinglycdn.com/files/0715f8d1-b263-4479-b428-2257c171ba71/la_ferme_des_animaux_resum.pdf
    • https://uploads.strikinglycdn.com/files/58bc28f4-1f95-47d0-8741-569c647271a2/xutijede.pdf
    • https://s3.amazonaws.com/tokafanawa/nonurosabipagiput.pdf
    • https://uploads.strikinglycdn.com/files/61498a6b-407f-40c0-8f11-f0c10b6ae80b/nujirisukexizugo.pdf
    • https://uploads.strikinglycdn.com/files/0cfa7f57-0337-4bfd-a73e-e8d8c5bff027/50748565358.pdf
    • https://s3.amazonaws.com/dowavelaxam/xuxom.pdf
    • https://uploads.strikinglycdn.com/files/11d2d622-681c-4b1b-bbba-1a1dbe17f5c9/zagumuwawojodufekozesage.pdf
    • https://uploads.strikinglycdn.com/files/0e81888b-74b6-4ea2-87fb-2c17b5b4866e/the_rabbi_s_cat_full_movie.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_off0000c785.bin
121f728b8e834e3913b6931c78689dbfcffa79b4c99e8b754909ee53f61df848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 4976 bytes
font_01_sfnt_off0000d890.bin
aa1510f591c087faa7ec6981cdad85f3bc9e0511065af164467adfa0583b37c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 9956 bytes

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