Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53f851985ff5e7a…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 03:14:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9a039e2d10f0552c10d8322d87d26acb SHA-1: ee07ba98879655c36203e4381bad8673a77ab15e SHA-256: f53f851985ff5e7a1b02d2f7b197df724fc47b4c4c35b47f116b32184de7f606
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and free item generators. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-ful-colour-brown-pant-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection-based attack, likely intended to lead the user to a phishing or malware download site.

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.tw/app/431946152/free-ful-colour-brown-pant-roblox-game-hack In PDF document text
    • http://casabea.de/images/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/i-think-i-just-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/free-roblox-gea_GM431946152.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
stream_004_off00005025.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5025 24564 bytes
SHA-256: fe50ce364c5b694c7ff4b98ae0a8800c9e3a31872e2e9639b508fa796abf2068
font_01_sfnt_off00008885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8885 18740 bytes
SHA-256: e70e1a67d93d87c1f00803a13970e1698092802771dfea7549d25526455e581f

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