Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa12a2cfb0915e0…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 15:01:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 32e2112f2b4462e74f8b05ff7d33e67d SHA-1: c90ec3169966f90a3ac438674602988dcd672c6c SHA-256: 3fa12a2cfb0915e0e00cf0fda0ffc7584b9e73c56b3d62fce5d1fed1bf190abd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/www-rbxhut-com-game-hack. The document body and heuristics indicate a lure for game-related cheats or currency, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/www-rbxhut-com-game-hack In PDF document text
    • http://windhorsetrek.com/userfiles/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-points_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/10-robux-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-hack-2021-working_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-pro-gamers_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
font_00_sfnt_off00003095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3095 22836 bytes
SHA-256: 8f85552c34caf778fbb31a83846e70d2d3819daf05cd2f267bb9873c776f5038
font_01_sfnt_off00006411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 19444 bytes
SHA-256: 60eab2e3afd0c7635d159dc58d933a25f8ff147bbc023de726d63f5eb8f1c975

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