Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba76f4efbc45eb08…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 16:46:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b52df21e54a5d1dcccb0ac73b295acb SHA-1: dced1bfe68b3cd5c24254a61a11eb410067a3a5b SHA-256: ba76f4efbc45eb081dee3503b1b0f884f5cb753aba83e4939d8ecaaa22932583
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links pointing to malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary link, http://netcdn.tw/app/431946152/robuxmatchcom-free-robux-game-hack, is flagged as malicious. The document body and heuristics indicate a lure to download a payload, likely for a game-related scam or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/robuxmatchcom-free-robux-game-hack In PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-roblox-exploits-2021-not-blocked-by-antivirus_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/hack-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-hack-in-nba-phenom-roblox_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/cheat-for-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/best-free-minecraft-server-hosting-reddit_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_off000032b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B4 22200 bytes
SHA-256: 6de11b235c3e9ad361460ba5afac097bfef0ffbf19b358a21d8ea1b3a34d36d2
font_01_sfnt_off0000640e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640E 19244 bytes
SHA-256: cff0d4d21023d1d0af59a0abdc5d0297996ab287ec72876132611e0e39db5cae

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