Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaf31fb79acb72e…

MALICIOUS

PDF

30.4 KB Created: 2021-07-19 00:58:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fdb6e360b74faa406ea4be4adf60aa13 SHA-1: e1bd95f33023221abd1fefe6d6f66dc34a0582c7 SHA-256: cfaf31fb79acb72e9933a713825b03b7130cebd6e342a4fc972d9166a26bb82e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and a call-to-action phrase related to a 'Roblox Hack 2021' generator. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document body and heuristics confirm the lure is for a game hack, likely to trick users into downloading malware or providing personal information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8665

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/roblox-hack-2021-game-hack In PDF document text
    • http://acp-institut.fr/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/mobihack-net-roblox-hack_GM431946152.pdfIn 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
font_00_sfnt_off0000225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225D 22028 bytes
SHA-256: 1f3cf33eb80a9ad23b5e9b3119f2cb8f4518b0b673ba3dea816fe65fc6c929f4
font_01_sfnt_off00005362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5362 18772 bytes
SHA-256: 8176d0e0dab2899da8c0ca184a8c984018431d9f5f9c3786fb2faef5db4d8820

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