Malicious PDF — malware analysis report

Static analysis result for SHA-256 f981c0bfccda5a66…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 02:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dc8187d00448690879d0ff744e18df3a SHA-1: 7b1d87b2d20c6e4ee6c63dedc0a896fc362473fe SHA-256: f981c0bfccda5a6675715babc88fe6f43d7d294a69b984a5abf27630335c8bd2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as generators for popular games. The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-free-clothes-codes-game-hack, which likely leads to further malicious content or malware download.

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-free-clothes-codes-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/i-succ-for-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/instal-cheat-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/dragon-ball-z-rage-roblox-hack-lua_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-card-codes-no-survey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacking-my-brothers-roblox-acaawaant_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-gift-card-cods_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-scripts-pastebin-grab-knife_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-rifle-script-hack_GM431946152.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_off000030f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F5 23048 bytes
SHA-256: ca097b4fddc853f88121e875c27b2b4226b664a6fe4104eb8768fc57e4b662c6
font_01_sfnt_off000064e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 19092 bytes
SHA-256: 4ec403e48f9a95d9b3f685304545c84adc4bd53ec77f062074c78298004be46e

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