Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b7f0cc6aa42b4…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 19:22:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 29006206e50e262a8b77fa086d9dfaf7 SHA-1: 579ee10b2f29a21adf83a54d169339378c0678ee SHA-256: c53b7f0cc6aa42b4ecb0b0155ba0e785c84d3662f96608654a3819ca04cc79c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/free-coin-master-s-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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/406889139/free-coin-master-s-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-robux-into-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/accessory-wings-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-roblox-accounts-using-inspect-element_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/control-other-players-roblox-script-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/www-roblox-com-free-download_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-how-to-get-free-gamepasses_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-make-acount-for-intriga-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-on-mobile-ios_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/comment-cheat-les-robux-ilimit_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-cheats-to-get-2021-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/static-moonactive_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/fan-page-coin-master_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_off000033b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B5 23368 bytes
SHA-256: 300f1ada2fb2fd03a39e3bd4b4960d7a97880fd49b99d54f258e496ac199e0b7
font_01_sfnt_off00006856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6856 17996 bytes
SHA-256: e73ad1949997423a3d5b1ae8c404e3daaf550eb6d6e5d8735e8b2899a6b2b9df