Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b4d95aa83d7805…

MALICIOUS

PDF

75.6 KB Created: 2020-11-12 22:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9814f17313b5cce8c27833c7fcf9e344 SHA-1: 7e6f8be06ce93df375718bf86342358f1467e74a SHA-256: f6b4d95aa83d78059d581f22017d019aa163b49b03fef609b8203b33c654d7f3
154 Risk Score

Malware Insights

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

The PDF contains an embedded link to a known malicious redirector, 'https://traffine.ru/strik?utm_term=alien+deck+duel+links'. This heuristic, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?utm_term=alien+deck+duel+links In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f8c0a6a55901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_5fa9399917718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5fa010dcb5cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5f99144cd3d1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fa9a2e8ed1fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5faba6e12d61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5f97564fe9dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5f98cec8b625d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f9eb17b89cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5f95484f9c5fa.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/278fa64e-f4e0-4b7a-a3e4-829004018146/rcr3273r_codes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a5fc8a-cb72-4184-9312-edc2f760d5a6/brawl_stars_bull_gadget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ed28f2-56ac-4b8f-ac22-7f661c40ca29/preparation_of_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 4680 bytes
SHA-256: de3347a32a5d39601290fc803c883a02063a3865d5b4067f96b637da59cccc64
font_01_sfnt_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 10732 bytes
SHA-256: 67567d7c97be98e364e09122e6a38d2a696f383eea8c0a73e5245ede432f9ad0
font_02_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 16092 bytes
SHA-256: 2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140

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