Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d90bb307bae8a8b…

MALICIOUS

PDF

35.2 KB Created: 2021-07-10 02:30:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1ac188b4b19e2f951f75cc907c6c2186 SHA-1: bf4af3e75b238dcfe7d554e1dd197896094aebd7 SHA-256: 7d90bb307bae8a8b021763c151c4cd3347d241bdd393b4cc9c4df3b050b80124
90 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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/coin-master-game-hack-kaise-kare-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hackear-roblox-apk_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/pubg-uc-and-bc-generator_GM1330123889.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-game-com_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/jailbreak-hack-roblox-money_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/roblox-hack-tool-download_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-are-people-hacking-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-a-dominus-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-offline-hack_GM406889139.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_off00003387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3387 22912 bytes
SHA-256: b6837ed7657f44a09d8b6365559e6ee150cb8ba0d63b232ea08ed2d78c29437c
font_01_sfnt_off000066f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F3 18264 bytes
SHA-256: a8389fbf181df9705b3255eb4c4696b43f8c72abea2faab980217b88f505b556

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