Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e233d3edd230c0…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 16:14:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d32cb12876c9434f5fc1750ba30da1a8 SHA-1: ea69cf9341ced3e90c4ba4ec383513638969a70d SHA-256: 65e233d3edd230c0ae94ac0374a3812857433f6fa8581ed03f1b5714704b4fa5
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/431946152/claim-free-robux-button-game-hack PDF link annotation
    • https://sundae.co.th/js/userfiles/files/royal-high-school-roblox-how-to-get-free-mony_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/robux-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-get-free-robux-2021-august_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-hacks-that-actually-work_GM406889139.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/how-to-get-free-money-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/best-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-real-no-fake_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-overseer-roblox_GM431946152.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://sundae.co.th/js/userfiles/files/free-robux-no-gift-card_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_off00002f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4D 22500 bytes
SHA-256: 98ea97348c516a65e792ee1c9ca4dc87f82e1f513e1254ff2661721c305834bb
font_01_sfnt_off000061c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C3 19276 bytes
SHA-256: 5ca6afd9ef6654ecee97696be31186890f5d02b6a4e0562937dffc5a9068c4b8

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