Malicious PDF — malware analysis report

Static analysis result for SHA-256 099cb75366dabe5a…

MALICIOUS

PDF

33.7 KB Created: 2021-07-21 17:12:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ebed23a960a204d94ed0b53e0d883309 SHA-1: 522af0ab0457bb3db82b1c5565e2dc8ae692e487 SHA-256: 099cb75366dabe5a38ffa8e7d6599a7403ef3b28feeb31d44d8ebe1fb7b6489d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, including one specifically for a 'free generator / game hack' lure. The document body explicitly contains the phrase 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the social engineering aspect. While no scripts were directly extracted, the PDF structure and embedded links suggest a malicious redirector chain designed to lead the user to a potentially harmful site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/how-do-you-get-free-robux-on-roblox-game-hack In PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://kfz-werkstatt-etp.de/images/how-to-hack-roblox-for-robux_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_off00002f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F27 22072 bytes
SHA-256: dadb361cb7b4c7fc9cf8601413d00eb3c7b3be49b027e189f13cdffdcd3e56fd
font_01_sfnt_off00005fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 18872 bytes
SHA-256: 24fd41772b4527d90362dac6de866a4ab7aa5c30c1e1928212e5c42b76e1fb73