Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5afecd59c61c026…

MALICIOUS

PDF

42.7 KB Created: 2021-06-13 21:42:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b991bd2e5c5b54776ac97f56ac41bf72 SHA-1: a429e7fb19edca3e995a967ba6bc0471a7e1cd1a SHA-256: c5afecd59c61c02695ac43d8bacec076eb8a1ab6a83fca20a693d185010ac1e8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action phrase, explicitly luring the user with promises of game hacks and free currency. The primary link, http://netcdn.co/app/431946152/how-to-inject-dll-roblox-hack-game-hack, is flagged as a redirector. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a malicious workflow, likely involving a redirect to a site that hosts malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-inject-dll-roblox-hack-game-hack PDF link annotation
    • http://sbm-nn.ru/images/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/the-roblox-game-and-online-free-without-login_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-sharingan-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-maniac-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-accounts-discord_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/hack-blob-sim-2-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-on-android-tablet_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/latest-free-spin-coin-master-daily_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_off000049d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D6 24684 bytes
SHA-256: 6aafb70b33e19f5192a52c61d0c2d993e352c1d1f06ea3baf30fb82e0375759c
font_01_sfnt_off0000829a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 18808 bytes
SHA-256: dc5dfcbdb6f4e3991469821f1105495835a6f828fdbc6caf380a2b03d3cc7dd5

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