Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d43083b11d40bc…

MALICIOUS

PDF

68.3 KB Created: 2020-12-25 15:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77369015de6f336f53ee920833dc6edb SHA-1: 18ad994cf03df461bf17baf636d789ea5197167d SHA-256: 81d43083b11d40bc82edaf764e812e14d5c1cb194111c4d97a44b704a1e5a389
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://traffmen.ru/strik?utm_term=retro+pinball+machine+ebay'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/strik?utm_term=retro+pinball+machine+ebay
    • https://cdn.sqhk.co/dokederajo/V8hjgeP/vested_simple_reversionary_bonus_calculation.pdf
    • https://cdn.sqhk.co/xobitabab/2ichbGa/smash_bros_ultimate_dlc_characters.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ziwuvijevo/macquarie_telecom_group_limited_annual_report_2018.pdf
    • https://uploads.strikinglycdn.com/files/939b2241-4955-4a6e-bf8e-7b328caff710/doctor_who_scarf_tom_baker.pdf
    • https://uploads.strikinglycdn.com/files/f77a98d5-4286-421d-8253-98a13fafdd05/tewutapo.pdf
    • https://s3.amazonaws.com/firigugixujotov/rojiwituzokogorifila.pdf
    • https://s3.amazonaws.com/kabisebax/canon_pixma_mg5320_user_manual.pdf
    • https://s3.amazonaws.com/sukobogixe/wovipujofemawanitogot.pdf
    • https://uploads.strikinglycdn.com/files/bc8896bb-5230-416a-806b-8575bfbfa9ff/minicraft_models_wiki.pdf
    • https://s3.amazonaws.com/wisatutadi/65672206197.pdf
    • https://uploads.strikinglycdn.com/files/7dbe33ae-86d5-471f-b056-7bc37baaf3ca/19722993410.pdf
    • https://uploads.strikinglycdn.com/files/cd703d6a-0301-4839-80e8-869d309d99e3/comer_arroz_crudo_causa_anemia.pdf
    • https://s3.amazonaws.com/dukavunivifa/halloween_movie_parents_guide_2018.pdf
    • https://s3.amazonaws.com/labitajaxatufib/33542128859.pdf
    • https://s3.amazonaws.com/henghuili-files/51034580680.pdf
    • https://uploads.strikinglycdn.com/files/77a522ec-339b-47f8-b5cb-ae0755592be5/forokelalovotopi.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_off0000cfb6.bin
125702c08186ece7627efbc94c0c11280817dbe60888361d97d6f8fd276321a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 5244 bytes
font_01_sfnt_off0000e16c.bin
3a240830e8a30f2b5a5034b839e2a31014883d6b7e559f2c3604dbe36a323892
pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10092 bytes