Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe876656a19044e7…

MALICIOUS

PDF

72.8 KB Created: 2020-12-22 00:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00dda6148cb060c81020487af56c816d SHA-1: 400e3725c66a80df09c7316396b814ff7d303986 SHA-256: fe876656a19044e7b3288bd10ebe572052c7c3b1abcfdf48e57a32c20176c366
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/strik?utm_term=dirt+bike+unchained+apk+obb'. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, contains text related to 'dirt bike unchained apk obb', suggesting a lure to download potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/strik?utm_term=dirt+bike+unchained+apk+obb In PDF document text
    • https://static.s123-cdn-static.com/uploads/4453909/normal_5fe1262a8dfd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fc16294de6a8.pdfIn PDF document text
    • https://wodelegijulafa.weebly.com/uploads/1/3/4/6/134677223/rizam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f8c61f3a9ec0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418379/normal_5fc3e41a7ace3.pdfIn PDF document text
    • https://jigulukeduza.weebly.com/uploads/1/3/4/5/134508725/1027124.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/10e54f3d-0e84-4053-b9ea-352ff286050f/how_to_stop_armitron_watch_from_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea8fd98-a363-464a-9ab1-cc870d57cf4c/nationalism_after_war_of_1812_apush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541601d0-a97c-4bcf-88f9-c8ad44dfdeea/general_knowledge_quiz_and_answers_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28223e02-c49e-4ec1-95ce-042f1b3cc818/iglesia_de_efeso_su_historia.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/glencoe_geometry_1-_2_skills_practice_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3791d0d5-7302-4cea-b16c-32a2d3da147b/specialized_hybrid_bike_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13fa61e2-e2a1-488e-9a57-2b32a75bc3a3/70689524823.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 5036 bytes
SHA-256: affbf31d667e75b38e42219e19f3e00f73a263d7ec3722c2430d340bd63ad3e3
font_01_sfnt_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 11012 bytes
SHA-256: 03987e8de5c882df00ac43ec958f31b8a3e21e3c5536f447fd58a1aeb0beeaaa
font_02_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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