Malicious PDF — malware analysis report

Static analysis result for SHA-256 f539bd4aa7db479e…

MALICIOUS

PDF

33.4 KB Created: 2021-07-23 18:02:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8a9c50e5ffb5a45a3d4cd55d4962d7ee SHA-1: 13f8fbb76d880d9569fade19fdfc708dd0cf86ed SHA-256: f539bd4aa7db479ed7ff111efa6be63cb704e5f731dab7dcb7be90acc952a59f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and a heuristic firing for a 'free generator / game hack' lure, indicating a social engineering attempt to redirect users to potentially malicious websites. The document body and embedded links suggest a scam related to popular games like Coin Master and Minecraft, aiming to trick users into clicking through to download malware or engage in phishing. No scripts were extracted from this sample, but the presence of numerous suspicious URLs points to a downloader or redirector pattern.

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/406889139/free-coin-master-links-game-hack PDF link annotation
    • http://aimp-market.ru/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://aimp-market.ru/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://aimp-market.ru/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://aimp-market.ru/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/minecraft-free-online_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_off00002eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDA 22804 bytes
SHA-256: e2e1ef9d215fe9ea098484310825bfe7c907f01a00e88e83ca3b1670f6e7005e
font_01_sfnt_off00006206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6206 17880 bytes
SHA-256: dfe41e252eeea42f6a4072e9595d4435e06b86b6ad2d398cb4b971b8bcb02477

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