Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e59d3a201113bc2…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 10:31:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cfbdf10409ba38d3e3676ac83bab0e79 SHA-1: 67367ad2d93b677023f26060b2eeac3a6010d275 SHA-256: 3e59d3a201113bc2ca64527c571c7de0bb31781341425e8d725ecfa3aec1281d
82 Risk Score

Malware Insights

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

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' lure. The embedded URL, https://netcdn.tw/app/431946152/invisible-pants-roblox-free-game-hack, likely serves as a redirector to a malicious site. The ML classifier also flagged this PDF as malicious with high probability. No scripts were extracted, but the document's structure and linked content suggest a social engineering attempt to trick users into visiting a potentially harmful website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.tw/app/431946152/invisible-pants-roblox-free-game-hack PDF link annotation
    • https://digilib.stieama.ac.id/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-tiktok-followers-without-downloading-apps_GM835599320.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coin_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-tiktok-likes-and-views_GM835599320.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-vote-kick-in-free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/2021-roblox-hacks-mac_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-bandana-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-can-u-get-free-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
stream_004_off00005130.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5130 27916 bytes
SHA-256: 799d191faa9dd1ac60525f119f33b6f79c36102dabfa3e06aed022107d6ae475
font_01_sfnt_off00008f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F40 18668 bytes
SHA-256: 05d36977a477897a4fef05a12151f6b9ba4641fc7c210c275309ffa70e216bac

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