Malicious PDF — malware analysis report

Static analysis result for SHA-256 858d9cad13fb2ce7…

MALICIOUS

PDF

42.8 KB Created: 2021-04-26 03:23:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 578bc130e4876f5b503a3946f541e5a0 SHA-1: 12e0cb668e0117a2ed876ac43f9d783be4cf6601 SHA-256: 858d9cad13fb2ce7d66158c742ae18b5434cbf4cf8f165da52b99e79e36f0179
82 Risk Score

Malware Insights

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

The PDF document contains multiple links and a call-to-action, masquerading as a tool to get free Robux for the game Roblox. The primary link directs to a URL associated with game hacks, indicating a lure for potentially malicious downloads or further exploitation. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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/assassin-hack-script-roblox-game-hack PDF link annotation
    • http://wattkit.com/images/roblox-20-body-free.pdfIn PDF document text
    • http://wattkit.com/images/free-robux-websites-2021.pdfIn PDF document text
    • http://wattkit.com/images/onlyrobux-site-roblox-hack.pdfIn PDF document text
    • http://wattkit.com/images/hack-para-roblox-de-robux-2021.pdfIn PDF document text
    • http://wattkit.com/images/free-admin-games-roblox.pdfIn PDF document text
    • http://wattkit.com/images/get-free-robux-right-now.pdfIn PDF document text
    • http://wattkit.com/images/how-to-get-the-riding-pass-for-roblox-free.pdfIn PDF document text
    • http://wattkit.com/images/how-to-get-free-robux-on-roblox-with-inspect-element.pdfIn PDF document text
    • http://wattkit.com/images/how-do-u-use-cheat-engin-with-roblox.pdfIn PDF document text
    • http://wattkit.com/images/free-robux-disocrd-servers.pdfIn PDF document text
    • https://freerobux.cyouIn PDF document text
    • https://robux-rank.comIn 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_off000042d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42D8 29240 bytes
SHA-256: e524fe425859e9cdc5d92d52ba15e3de64f9c5358af2be7aff382c0a536e4a79
font_01_sfnt_off000084b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B0 18580 bytes
SHA-256: 1c6f7d1cecccfb926395b3d8752c29ea1d48de6ff6df225ef8b9022d0d118cf1

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