Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dd64ac6d711c76…

MALICIOUS

PDF

68.1 KB Created: 2020-12-14 04:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afd2e8919ba2f8561f8cf565f08490cd SHA-1: ea6175909c350f1b07cf4f8ea6dd4a2c1c607352 SHA-256: 36dd64ac6d711c76114024076e202e021793d90ddb47bdb0bad3f83f63587793
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/wb?keyword=messenger%20for%20pc%20windows%208.%201'. This indicates the document is designed to trick users into downloading or accessing malicious content by impersonating a legitimate software download. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/wb?keyword=messenger%20for%20pc%20windows%208.%201 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5f8ba662cc898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5f9f9a44ee901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_5fac036bf1d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f9815f13ae98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f8e979f6bd27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_5fd15b2ebf1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_5fa7fe5eef42d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f923fd332423.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/6ee3ace0-7a2b-4516-8af0-f3b05e7418b7/garbage_truck_song_taiwan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7c89955c744b53b4369/t/5fc15ede3c02f22b9d405d1b/1606508255150/14250398395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abd90b9-87a5-40d7-af61-a89ae75bfdf2/turkey_gobble_ringtone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0e35cc750a3b5a0882c0/1606225465887/guzalobojawefefox.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0c59e18c5c478ec3096f/1606290523855/xevozowe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc325ec9955c744b54a24d6/t/5fc5269a18e72e5fdb7d004c/1606755997996/19223906114.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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 5456 bytes
SHA-256: 60675d22b23cfa87fc519b6040023c811ed7ac511a62641e452182aab953d704
font_01_sfnt_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 11804 bytes
SHA-256: b20b876eaf9cc3fff1b8595e59b76da9b54de9a98a0d3ed3a6b96913111e7ab9

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