Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cab78556af0ad56…

MALICIOUS

PDF

33.1 KB Created: 2021-07-06 06:39:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 85a7255eee1fa996faeadb89016af63c SHA-1: b48674becde044529bb03a03102af69a2ae5e96f SHA-256: 5cab78556af0ad562b5621135e0ac3afaa4a905395f0e5b5efd009ef369241c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains related to academic institutions but appear to be serving malicious content. The primary URL, http://netcdn.tw/app/431946152/cute-free-stuff-on-roblox-game-hack, suggests a lure for game-related cheats or hacks. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the embedded URLs and the ML classification point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/cute-free-stuff-on-roblox-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-account-roblox-biz_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/roblox-november-2021-hacks_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/pokemon-go-free-hack-download_GM1094591345.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-roblox-accounts-using-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/cool-free-roblox-shirts_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/fly-hack-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B07 22516 bytes
SHA-256: 13878afa8aeb4c15faeb63c4f707cb7a8a22bac854a4fda0d29a7c81dcbb2902
font_01_sfnt_off00005d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2C 18896 bytes
SHA-256: 075f8cd774aca912a52d3a00929a8a2a62f8afb53e3281e7dfbbf780f705a182

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