Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09c67d978fb0eb5…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 13:55:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4797fcc91c060612a44957993bdb6115 SHA-1: b729e593ded34ff91994978bb79fc4e51b9132f0 SHA-256: a09c67d978fb0eb5f22866e1701ff4bb1da92c217bc3c0d2abfb368665d8caa9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link disguised as a game hack generator, specifically for Roblox Mad City. This lure is a common tactic to trick users into visiting malicious websites. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics confirm the presence of external URIs and game hack redirect lures. No scripts were extracted, but the document's structure and embedded links strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-mad-city-season-4-hack-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-girl_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/is-minecraft-dungeons-free_GM479516143.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_off00004f66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F66 26668 bytes
SHA-256: a0d94fd27bc00485557fbff6328f760b501b1d220abf342f233efa1f72ca007e
font_01_sfnt_off00008a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A79 19020 bytes
SHA-256: d7cbcd5e096056ecdaa9fcb99f66c4aef511e8215c124778e3e652dfc4330689

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