Malicious PDF — malware analysis report

Static analysis result for SHA-256 425dc933d12c3f75…

MALICIOUS

PDF

70.0 KB Created: 2020-12-02 22:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4020b6ed0e85d2477e346e534d3904df SHA-1: 76acec46410eafca31d2f69d0ef6ba49e3c59377 SHA-256: 425dc933d12c3f75675fabb30b13de21115ec8467709394874fc22602d6fae8a
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, with one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains strings related to 'Dunkin donuts competitive advantage' and 'wkhtmltopdf', suggesting a potential lure or obfuscation technique. The presence of numerous external PDF links points towards a link farm or redirection strategy.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=dunkin+donuts+competitive+advantage
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f8aa77f29258.pdf
    • https://static.s123-cdn-static.com/uploads/4457604/normal_5fc594458af5f.pdf
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/zimakusadu.pdf
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5fa162ea3cf13.pdf
    • https://bujugumaxu.weebly.com/uploads/1/3/4/0/134096797/3058118.pdf
    • https://cdn-cms.f-static.net/uploads/4503787/normal_5fb0255a456cc.pdf
    • https://muxosafexokole.weebly.com/uploads/1/3/4/4/134485240/dc84cda798f1f.pdf
    • https://lisijinawap.weebly.com/uploads/1/3/4/7/134740049/72118c15.pdf
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/d04d1c2d3d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1f46eaf37e3b646474a1/1606295366380/vagivuredab.pdf
    • https://static1.squarespace.com/static/5fc0ed4f1452f90b7fe57e24/t/5fc5d7485147b14804fd0a20/1606801227814/44383908893.pdf
    • https://static1.squarespace.com/static/5fc2983b9955c744b5466208/t/5fc53ab27acac6192a6bd3fc/1606761140752/kidiforosovijik.pdf
    • https://static1.squarespace.com/static/5fc32a51cd1e280355e2ea57/t/5fc54b047acac6192a70424a/1606765317240/russian_bear_5000_ingredients.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0421173fb5383b68afcd/1606288421995/lewis_dot_diagrams__structures_worksheet_answers.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf3861491241adc44c127/1606218631462/nelonevaripamuzu.pdf
    • https://uploads.strikinglycdn.com/files/98cd1cf0-1092-4d0e-a76b-c3592bae1e19/el_reino_del_dragon_de_oro_google_drive.pdf
    • https://uploads.strikinglycdn.com/files/15027691-2746-467d-b602-f2f2766b5f91/35744201104.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_off0000d38a.bin
4dd854d6ecc85ceb238840cb6632717e8c6b431f4e00d733502b8dd5aa78ece2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 5388 bytes
font_01_sfnt_off0000e5e3.bin
1227b9eb38251e3f4e6747752b9f781fae465aa8d3efc80d52de6ef65aedeb2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 10896 bytes

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