Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1f61d256b656ed…

MALICIOUS

PDF

41.7 KB Created: 2021-05-12 20:32:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fdc8c151fe37df84f303ba726cf67cf5 SHA-1: dcae1bcf82ed4cef0363eac62803d746c8cb348d SHA-256: 6d1f61d256b656ed5522be7e99a2ba83382cc7d77feaf6e66530d7735e4008a7
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 0.9971

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.xyz/app/406889139/daily-coin-master-free-spin-link-game-hack PDF link annotation
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/roblox-hacked-version-download_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_003_off00004843.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4843 24204 bytes
SHA-256: 2211438b28c4ff5a5fcaf216d59bd5152173aad560d757eb35a7da4c12fe52aa
font_01_sfnt_off00008009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8009 18476 bytes
SHA-256: 0e8ff706f766ebeac8fd51df3b46864e48e50accc558ba14dc70aa8347bf43ac

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