Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb224ebe6adee2d…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 07:41:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d46218c2a6863456161df2f0306bc64c SHA-1: 555ffacec43cbe1e308fbf1b4c85a6a5f1eaa663 SHA-256: 5fb224ebe6adee2d1f1a7d5e8c51141f66151f6d6e56dfa1ccd6497854231a5b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hacking-pesonn-roblox-script-game-hack PDF link annotation
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-hack-extreme-nijecotr_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-make-a-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-hacker-shirt_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-girl-games-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-cheat-in-roblox-paint-n-guess_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-hack-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/how-to-get-free-robux-on-roblox-tablet_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-full-colour-brown-pant-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/roblox-jailbreak-speed-hack-download_GM431946152.pdfIn PDF document text
    • http://pustaka.fhuk.unand.ac.id/repository/free-robux-android-2021_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_004_off00005375.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5375 25864 bytes
SHA-256: b01238e38ad162da67cebdc3de3844c9a9b5d9acc05d189f626a0f75b54be203
font_01_sfnt_off00008e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6A 19024 bytes
SHA-256: 6a47c7a207be9f8ccf6c48432d7a73e6f0c196d3eb73138d94aeb4e8adcd5d9c

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