Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1bfde8694d4e7b…

MALICIOUS

PDF

44.2 KB Created: 2021-06-08 17:30:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6987bb30c67db0ef845ead48a252591e SHA-1: 1faf840341c912ac2ce51fd725f84e40d1ac2c72 SHA-256: 1d1bfde8694d4e7bca6b20ec129af2d8e6fac04373f979da0b6eba2616e3f15b
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 0.9865

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/hack-roblox-window-game-hack PDF link annotation
    • https://repository.poltekkesgorontalo.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/minecraft_GM479516143.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://repository.poltekkesgorontalo.ac.id/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.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_off00004fd0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD0 24948 bytes
SHA-256: 36f1af66c16ff680c256dd4a0b99fc19e16206f18309aa239ed1c1a00ff415f4
font_01_sfnt_off00008865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 18840 bytes
SHA-256: 4cc8fe0edaff2fd1d46a342bba5a8a399216330d505c787a513fe76498e55c33

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