Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a5faf83bb75475…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 18:59:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1ea7bc1be6d4614129cd3037879293de SHA-1: 4970dbb3086d8c187cd2cb6a450bc00b84ca1801 SHA-256: 49a5faf83bb7547513e62dc9fc6f8565b6aeea763489fd625b078ac548cfedeb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, including a known malicious redirector at http://netcdn.tw/app/431946152/roblox-jailbreak-hack-download-game-hack. The document body and extracted URLs indicate a lure for game-related cheats and hacks, a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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/431946152/roblox-jailbreak-hack-download-game-hack In PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-hack-no-scam_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/my-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/try-on-all-animations-for-free-roblox-script_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/robux-free-xyz-works_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/hidden-immunity-idol-survivor-roblox-hack_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/robloxcom-how-to-get-free-robux-only-today-ad_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-cheat-engine-70-bypass-2021_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/774-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_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
stream_002_off00002e0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E0B 22496 bytes
SHA-256: 12fc5b3f22740ff7a960da19f2e08dde5cc305e445aea5fb8298f5809d06a3fa
font_01_sfnt_off00006047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6047 19448 bytes
SHA-256: c6b402b96529d0790e5d7e1f1484851c98e2ea285be43ed7d04bfb6fa8727121

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