Malicious PDF — malware analysis report

Static analysis result for SHA-256 81efb8ff0ddd4312…

MALICIOUS

PDF

78.0 KB Created: 2020-12-24 21:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 93c07f8db984bf2db26315049492623e SHA-1: 9845f0ae66650369e726a71c01b6e6af12d015e6 SHA-256: 81efb8ff0ddd431233f1ac0e45eaae3fa4ccbf61204d348ed1e4883c8381648b
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://gettraff.ru/strik?utm_term=gacha+world+free+download+pc'. The document body, though heavily obfuscated, contains text related to 'Gacha world free download pc', suggesting a phishing or scam lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=gacha+world+free+download+pc In PDF document text
    • https://cdn.sqhk.co/xubenijevewe/5r5Qics/58090702747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f8be661e2abb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fd04f56780ad.pdfIn PDF document text
    • https://dikoriwapajok.weebly.com/uploads/1/3/4/4/134447187/fetafudu.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/bafa5601-98e8-4e2d-82ac-6448d0af81d2/93655874467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531fcaef-65ad-4dac-86dd-3b2c80396d56/kesinon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6086cbd5-8a9c-4ea6-8692-4a8eb707f2c6/knowledge_questions_about_art.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/caractersticas_del_aprendizaje_significativo_y_memorstico.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/glencoe_mcgraw_hill_florida_geometry_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f51c543-f428-4611-9652-6fd2ebf0bcea/vafaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be574eaa-1796-4692-917a-45d306dea557/sasalawijox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 4132 bytes
SHA-256: a8959f96e281bba008c71e1abda74c820398d5e48c2ddc916190cf52d9742d06
font_01_sfnt_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 5188 bytes
SHA-256: 15ba8213376550e8942a3d67cd53a9f1f639c5b53d6e5905de8e80e3c1df3f1c
font_02_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 11096 bytes
SHA-256: f097c6aa70a5019168e8b6f4373f03ae5ae323fffda0161d07f0ba99e1ba141a
font_03_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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