Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dbffa2f78d12c0…

MALICIOUS

PDF

65.0 KB Created: 2020-12-27 00:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f352774af27b6c4f1146b877194fa371 SHA-1: bdf2c27a2d3e39a832830342efc821ca84ec7760 SHA-256: 31dbffa2f78d12c0ab90adedaa7ff8e4ef92264b1dda3f64c19821aa8018e845
222 Risk Score
Tags
free-cdn-ebook-manual-lure

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://cctraff.ru/strik'. Additionally, it exhibits a PDF link farm heuristic, suggesting it's part of a larger SEO-based malicious campaign. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?utm_term=monster+maker+online+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fc5b63699e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_5fd2aab39403c.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/vokujipokud-dusiwetojevisop-wazexususugili-wovevew.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/2474781.pdfIn PDF document text
    • https://cdn.sqhk.co/sawapevodef/iTghih3/segubiwaxawekor.pdfIn PDF document text
    • https://cdn.sqhk.co/pakuvesajuwo/6Jgcjf3/67299965454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/73620341064.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/varigapedupazofewi.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/identifying_minerals_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/zolozudutinigugokigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fde467ef-3328-4086-8b62-f79f8e51ed55/herpes_test_kit_nhs.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/independent_auditor_s_report_meaning.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 4980 bytes
SHA-256: 3388c118a8a71323322a5cbf93f19b0788cb1d0a0bb9070b9cdfbc5b239a9553
font_01_sfnt_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 11364 bytes
SHA-256: 330274ba0bec74aa2c86d90b931b4f8b1dad705ce98659fe8c61cb9444e6bebb

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