Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7e588b5612c847…

MALICIOUS

PDF

44.7 KB Created: 2021-06-10 16:02:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-19
MD5: 519c7789afd577be30503d092ab0ab13 SHA-1: c9e6d8aaaae0147166043fad052a3334304f0eef SHA-256: cd7e588b5612c847badce2b947f4fd47063f72ef62764f1d16943ab79ff15c4b
200 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • 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.tw/app/431946152/free-roblox-dll-injector-game-hack In PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-deals_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-ad-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/robux-survey_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-fly-hack_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
stream_004_off00004d03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D03 28104 bytes
SHA-256: 6d2657e622a929b6b169b817c42c104563be4aa7a1a949c981bb86dbea731b97
font_01_sfnt_off00008b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B97 18408 bytes
SHA-256: f32ba8e521f13c372d947d45710eaea93c6c0a20a3f2f4a77b8cb7afeeab26ba

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