Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bb42950387eeb7…

MALICIOUS

PDF

33.1 KB Created: 2021-06-25 23:41:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e19eb0c05198ec296f40eb85b3b9964a SHA-1: 538d628fcf16018b1fd42f0d7012b2b7cc749205 SHA-256: 18bb42950387eeb76b0bb4179c8a61e276a1f004b2e4c80781c36c90e6a9da72
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to websites offering "free game hacks" and "robux generators", specifically mentioning Roblox. The heuristic "PDF_GAME_HACK_REDIRECT_LURE" confirms this intent. The document body also contains a "CLICK HERE TO ACCESS ROBUX GENERATOR" call to action, reinforcing the social engineering aspect. The primary URL, http://netcdn.co/app/431946152/roblox-tycoons-free-game-hack, is the most critical IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-tycoons-free-game-hack PDF link annotation
    • http://zercalo.org/images/roblox-creepypasta-free-candy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-costumes-in-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-hack-in-game_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hack-de-robloxdecom_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/climrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-games-easy_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-hack-app_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/can-you-give-me-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
font_00_sfnt_off00002ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE9 21708 bytes
SHA-256: d38a9d6e58fe6b5e9bb5c6040fe9ab8db49c248fad3c1c199841acd3b1df4d94
font_01_sfnt_off00005cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBD 18828 bytes
SHA-256: f7aa54f3ca77f817d1b2dc2c8a4dc46dc281bdd7a5bee3a507a469ec4b49fea6

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