Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1e86c84482cc1e…

MALICIOUS

PDF

33.1 KB Created: 2021-07-21 05:50:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ef29d038532158bed49715f168eaac89 SHA-1: 2f1f9d0de3d37c6c4fbbe7158da295516baf3d39 SHA-256: 8b1e86c84482cc1eed9d1acc4d1874c4910bcc982c571bb56587b75193c90cfe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux' or game hacks. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-studio-free-robux-game-hack, which is flagged as a known malicious redirector. The document body also contains a call-to-action to access a 'ROBUX GENERATOR', reinforcing the lure. No scripts were extracted, but the embedded URLs and redirector heuristics strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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-studio-free-robux-game-hack In PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://wgdirect.ca/wp-content/uploads/fsqm-files/tiktok-like-bot-free_GM835599320.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_off00002dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD3 21992 bytes
SHA-256: 7e6eec9e257ce01da814ab8571065155f9a5bb2b0b5c2b3c6ca30120d109ffec
font_01_sfnt_off00005e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1B 18672 bytes
SHA-256: 3bd80a243d6dfb512aa98580ada44d31240e9921df0bc1b6142d5d2cafa1550d

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