Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e857b6650fe2c8b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 05:21:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 388ab5fead3658801355b777fd4b0c15 SHA-1: 7e017d65a7051ef7e813d4fa7964e5078801aaed SHA-256: 4e857b6650fe2c8b1ff5e7ac42b8d0cb4c9035a8f7accad2d090d7827507e47d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/gaming-dunia-coin-master-free-spins-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-how-to-use-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/paid-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-accounts-with-passwords-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/commands-for-free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/gta-5-hack-roblox_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_off0000321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321A 22744 bytes
SHA-256: 8528b89ff5f0790793202851d18a8bb39b7ed23b6fa611f03548bcb22ae33a1c
font_01_sfnt_off000064f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F7 18740 bytes
SHA-256: b864314b23136acdbc9cef453e72c763c24c6f69c6a5d08d10340e372cc06804

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