Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3a16f2f0d127ba…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 02:34:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7de85b6963c4de94091e7ed1c1167969 SHA-1: c1d2d8c6c9c9e8e4ef4429568c63c0b6a6cf5323 SHA-256: 0a3a16f2f0d127ba9a5000ca8352bb4acc14bf1ad27f61a29dc7c6bebaa10573
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic flagging it as a lure for game hacks and redirects users to a suspicious URL. The document body, though partially corrupted, contains references to 'Roblox Studio Free Download' and multiple URLs related to game hacks and generators. The presence of embedded URLs and the ML classifier's strong positive prediction indicate a malicious intent to trick users into downloading potentially harmful content or visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-studio-free-download-game-hack PDF link annotation
    • http://fia.ub.ac.id/katalog/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fia.ub.ac.id/katalog/repository/blogspot-coin-master-free-spins_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
stream_003_off00004970.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4970 25144 bytes
SHA-256: 686fa3c21b9962f185269d983dee592b933ede2b3a3b1cc893144e32b006b026
font_01_sfnt_off000083bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BF 19048 bytes
SHA-256: 285731f73243192995ef55c7bff5b12d0277a9b461a1d4b1bbd56785699d0c43

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