Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d5307dcbe76602…

MALICIOUS

PDF

37.2 KB Created: 2021-05-12 01:49:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 36af815e46e7bea7ce3652cb646f8b72 SHA-1: cf715e9e5535bec30c209034594c49c9f09f2694 SHA-256: 35d5307dcbe76602f15d71fddfaf3327f7fc7b3b87419b2cd61e1a4ecd560658
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link that redirects to known malicious infrastructure, masquerading as a 'free generator / game hack'. It also displays a fake CAPTCHA, intended to trick users into interacting with the malicious content. The document's structure and embedded link suggest it is part of a phishing or scam campaign designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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://netcdn.xyz/app/406889139/coin-master-online-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000352d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x352D 26156 bytes
SHA-256: 5b643d821bc2f00489312f8dc0bd9380e8444287ab14917639ee954fe565c77d
font_01_sfnt_off00007212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7212 17620 bytes
SHA-256: 869d7695d274e208c7f4dfde8f160970e62420a8a3a2b9cf02de0f643df516c0

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