Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde13690b18c8118…

MALICIOUS

PDF

42.9 KB Created: 2021-05-10 17:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b16e00549ddf3499ed462e3e2ae7e15a SHA-1: 5c425cb624b941ae049246711ff3d354a14ae2c6 SHA-256: dde13690b18c81184df8125a390f4bcd961b25ace8a91cf7e3bb964fefcb61f9
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites that promise game hacks and free in-game currency, such as Robux. This is a common lure to trick users into downloading malicious files or visiting phishing sites. The heuristic findings indicate that the PDF is designed to redirect users to these lures, and the ML classifier strongly flags it as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lure suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/what-is-a-robux-game-hack PDF link annotation
    • http://5prudov.ru/images/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://5prudov.ru/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://5prudov.ru/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://5prudov.ru/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://5prudov.ru/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://5prudov.ru/images/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://5prudov.ru/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://5prudov.ru/images/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://5prudov.ru/images/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://5prudov.ru/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://5prudov.ru/images/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://5prudov.ru/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://5prudov.ru/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://5prudov.ru/images/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://5prudov.ru/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://5prudov.ru/images/coin-master-free-spins-link-2021-download_GM406889139.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_003_off000045a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45A5 27372 bytes
SHA-256: e2dd412a35060c07dc9ad06dd9ae6c71bfef80f5ed7d86162d0b61ce7221051a
font_01_sfnt_off000084b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B8 18548 bytes
SHA-256: 3316b7a4d548223335f333f1efaf0184c5ffecf7c7bacabb6dd9a6d8e3ca5dd1

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