Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c8bc3abdf296c8…

MALICIOUS

PDF

47.4 KB Created: 2021-06-11 03:05:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4f37d6648a94d4deaabee06a1dda0888 SHA-1: 7461c77ad5833a1b3563e512274f33c868a01c76 SHA-256: 42c8bc3abdf296c8bb2140b87389426a5fdf1087ac4afe0879ce247ab30efd9f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a game hack, which redirects to a malicious URL. This is a common lure to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection attempt, likely to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/roblox-free-version-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/download-roblox-clothes-free-online_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-is-hacked-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/apps-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/mcpe_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-online-roblox-gift-cards_GM431946152.pdfIn 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_off00004db3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB3 25812 bytes
SHA-256: 8152b8232968e43f8c75f2feccf87ac789b061f50a4acffea0fbecbd01931d99
font_01_sfnt_off000089d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D8 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000096e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E9 18200 bytes
SHA-256: 016ddb194cc831d4c0b8dc85f79d6f229ad041dc2b6f930009b559cae185898c

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