Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16cc8e366f9f94e…

MALICIOUS

PDF

33.3 KB Created: 2021-07-19 03:42:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d793654dc81b728effcef0d59e001f75 SHA-1: c7baadf4b361606dcddf8e8aa9b1c4b78ff07f89 SHA-256: a16cc8e366f9f94eba949b40338e5771f61ae1bcff5da98b707348532eb78a6a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to hacking games and obtaining free in-game currency, directing users to a suspicious URL. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the embedded URL 'http://netcdn.tw/app/431946152/how-to-hack-roblox-to-get-robux-game-hack' strongly indicate a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.tw/app/431946152/how-to-hack-roblox-to-get-robux-game-hack PDF link annotation
    • https://wandpiraten.de/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://wandpiraten.de/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://wandpiraten.de/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://wandpiraten.de/images/www-free-robux_GM431946152.pdfIn PDF document text
    • https://wandpiraten.de/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://wandpiraten.de/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://wandpiraten.de/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://wandpiraten.de/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://wandpiraten.de/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://wandpiraten.de/images/download-minecraft-free-hiapphere_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
font_00_sfnt_off00002d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D73 22168 bytes
SHA-256: edc7c473fd713beb084516a2efef4d30d61c1ac8781e7d32ad42c559f5a8b491
font_01_sfnt_off00005e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8C 18776 bytes
SHA-256: 578b373aa423cb9d98cc6cf60d475741153d940cfb786bc6bb83321400a66c6d

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