Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dfbb163c679606…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 22:42:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89bd45f9f13faf8693f82b2789ce834f SHA-1: 537332488f339daa75354f436dfa297f90eab50a SHA-256: 28dfbb163c679606d3c744b63d94413672e083878a7448d52aa98a4f4cf9000b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a visual call-to-action, suggesting it is designed to trick users into downloading a file. The primary URL, https://netcdn.online/app/406889139/50-000-free-spins-coin-master-game-hack, is presented as a lure for game-related rewards. While no scripts were explicitly extracted, the ML classifier flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/50-000-free-spins-coin-master-game-hack In PDF document text
    • http://elibrary.uinbanten.ac.id/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/descargar-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uinbanten.ac.id/repository/minecraft-hacks-for-2b2t_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_off000052ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52ED 24692 bytes
SHA-256: 47e74dfe999c37ab8e8f496822e6553187b6af41d63cd336b9a20d6dd6d39238
font_01_sfnt_off00008bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB0 18192 bytes
SHA-256: a4943b7840cd3959a8ceaa1ed690fa7e50048a9b71dafef76241fe8ac415bb35

Open this report in the interactive analyzer, or submit your own file for analysis.