Malicious PDF — malware analysis report

Static analysis result for SHA-256 955a7ebebfb8ff72…

MALICIOUS

PDF

80.2 KB Created: 2020-12-26 00:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 71a72d5a68c121f11e6d270dc6e903a6 SHA-1: 9286fc0daa01d3d9eac2b87827154e79cb10f6d3 SHA-256: 955a7ebebfb8ff723810238687a376c35686c89453ab96a4eb6c9a91756f805c
214 Risk Score

Malware Insights

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

This PDF document was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, indicating malicious intent. It contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. The primary malicious URL identified is https://gettraff.ru/strik. The document body is heavily obfuscated and contains what appears to be junk data, but the presence of embedded URLs and the heuristic firings strongly suggest it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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=youtube+videos+de+plants+vs+zombies+2 In PDF document text
    • https://cdn.sqhk.co/buwowunuras/fG4hfXJ/96258437293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5fe1b2fb51048.pdfIn PDF document text
    • https://dudabiwik.weebly.com/uploads/1/3/4/3/134354119/9535936.pdfIn PDF document text
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/vewoj-pivesuwitotexo-rofefuzaluvaw.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/dezuvawedofukijutoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f8cfe7a9318a.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/ajgV5CT/mortal_kombat_xbox_one_fatalities.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5fde1ef97475f.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/5xDrpgj/naxakibazepevitebopenu.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://s3.amazonaws.com/bezegoluzose/87815090600.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/mejiluxazuza.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/sajakunerenoba.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/2018_monthly_calendar_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/12417318769.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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5232 bytes
SHA-256: 220e8a83320dc3cadb1fc467d0e5e44fdce6b9b12ee7772dc6ea0e7aa525a092
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10728 bytes
SHA-256: d8be1277befdab0caf677c97795bc502293087c2a34e71b129c91624976ca876
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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