Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff6ec5a9549cfb4…

MALICIOUS

PDF

35.3 KB Created: 2021-05-11 06:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c6461d958a9f20597a3daa481a6ca67d SHA-1: 74eae6b593e43bbb4f9ebead631f8856975d6eaa SHA-256: cff6ec5a9549cfb49b3640d67bdddc8be49a1094ef8cc71e4b00ce6dd361a0ad
210 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' and impersonates Microsoft, directing users to a malicious redirector. The document displays a fake CAPTCHA and a call-to-action button to trick users into clicking the malicious link. The embedded URL leads to known malicious infrastructure, suggesting an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-troll-outfits-free-game-hack.
  • 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/431946152/roblox-troll-outfits-free-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_off00002e44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E44 24984 bytes
SHA-256: c378b30ce1e7660da6a99981cde69974cb653a98e9d50d1d3b0fd2a846d5915b
font_01_sfnt_off00006860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 18312 bytes
SHA-256: d7a6054ad6450820976bdf97a593247089bbc5ee73a255b9938ff1244ab0e13d

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