Malicious PDF — malware analysis report

Static analysis result for SHA-256 8539b33c231faaf1…

MALICIOUS

PDF

34.5 KB Created: 2021-06-27 22:54:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c32b6ce1b69d37a40b50f6066b69a68 SHA-1: 09a07ac5170c193263b615a4676bc93fd27a2677 SHA-256: 8539b33c231faaf14bdd151471f50e7f07d5c3104937944bfbd46e710f52c9b0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a malicious redirector, specifically advertising a 'free generator / game hack'. The document body confirms this lure with the URL http://netcdn.co/app/431946152/getting-robux-with-cheat-engine-game-hack. This indicates a social engineering attempt to trick users into visiting potentially harmful sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/getting-robux-with-cheat-engine-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/static-moonactive-net_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-execute-my-hack-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-noclip-using-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-username-and-password-in-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/circuit-breaker-free-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/tiktok-free-view-jelly-fruit_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roblox-mguis-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-spin-link-coin-master_GM406889139.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_off00002f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F35 22524 bytes
SHA-256: 312f9ffbc2bcd1ed1bdd5942dbd96a8f89146294e2fee6d4cee43249d2c5254f
font_01_sfnt_off0000616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 19140 bytes
SHA-256: a6924c2eca4bc27a5cdadb5d4ad36002669e77234502a2adf89988fce6a36def

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