Malicious PDF — malware analysis report

Static analysis result for SHA-256 275d22e62cba9b47…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 22:32:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1bcb0db6adf0e72e47d62cb5a21c39bd SHA-1: c93fb15f5ad17593cc9aeade6c1a67c3176f7e29 SHA-256: 275d22e62cba9b476d5e3132313ab2cca405cea976f8a182ef9d26df9c69c33e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free in-game currency and hacks. The primary link, http://netcdn.tw/app/431946152/roblox-free-robux-no-verification-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a potentially harmful site, likely for credential harvesting or malware delivery.

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.tw/app/431946152/roblox-free-robux-no-verification-game-hack In PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-apocalypse-rising-hack-tool_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-how-to-get-a-non-free-model_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-one-piece-pirates-wrath-hacks_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-wanted-money-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-cash-grab-simulator-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-bonus_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_off00002fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE7 22096 bytes
SHA-256: 6f366ddba1c76b8c8ffdfe32e47e8a3d038f220324e3d943885bde0c2e08bac5
font_01_sfnt_off000060c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 19148 bytes
SHA-256: 8dddf83a8dc305c7bfb211f3bc3fbf3b1849d9dcf887b2c8b2fcb602871e3305

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