Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af242b7a23a000f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 20:09:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: f770bfcec0af14704b8aafe58060561d SHA-1: 583a45981e7ae536496aee92c68fcb837da67c16 SHA-256: 4af242b7a23a000f88e2d4c35479b7b32a6fc99286806355b698e8f91932c0ad
160 Risk Score

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/free-shirt-roblox-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-no-head-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-games-to-play-online_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-free-wings_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
font_00_sfnt_off00003098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3098 22376 bytes
SHA-256: 6e8f7ab1a2e977c08a943a17662a194f0e29e3f3af2b67be942c00c3e5138d59
font_01_sfnt_off0000626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626A 19040 bytes
SHA-256: 8a67ccebab0fe3b566ae0770e8520ba5e7e7d391d67ba1893e8493474ec694fe

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