Malicious PDF — malware analysis report

Static analysis result for SHA-256 4255c4b9a772092d…

MALICIOUS

PDF

50.7 KB Created: 2021-06-09 03:07:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-15
MD5: fb7601b5fd34f0b64fa3cbd9a19b81c0 SHA-1: 7459bb304764eef1d7afe0a635f419ef5d830425 SHA-256: 4255c4b9a772092d4d2b5527e800270ab563f01cc4a6299dae591dc0e47ec0e0
240 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 6

  • 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
  • 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
  • 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/any-free-roblox-exploits-2021-reddit-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-vietnam-2021-hacks_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-no-wait-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/tiktok-free-view-iphone-theme_GM835599320.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-attack-block-hack_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-rbxnow_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://collectrobuxIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005510.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5510 28792 bytes
SHA-256: e33261f2f55a78bc9ae4e7c56e2b334b50542068b20f28cbeaaeaa9786159f83
font_01_sfnt_off0000974c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x974C 2880 bytes
SHA-256: 552e62132cae3603ce0819827e44d96a992bd06014cc5080bf3af4b2ea155b3e
font_02_sfnt_off0000a125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA125 19104 bytes
SHA-256: 8f799f25b051e69cfe1bddf18e4a6e38016199c677f80287c200ff44609ab97b

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