Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a8f03529a1f152…

MALICIOUS

PDF

36.5 KB Created: 2021-07-04 23:50:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a85eb41599e4e985e270be80ce7dce15 SHA-1: abd7f6579475fb996787dc69fdf751d32071c0f9 SHA-256: 20a8f03529a1f152d8a81907047f4f240dfbfc9f38214225e3296ffb0fc44576
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-hack-spins-app-game-hack PDF link annotation
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-make-your-roblox-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-hack-any-server-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/cheat-engine-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-roblox-accounts-with-obc-and-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/speed-city-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-get-a-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-do-you-get-a-lot-of-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/youtube-how-to-play-roblox-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-no-scaam_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_002_off000037b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37B4 23376 bytes
SHA-256: 4e05dbc2c8164e054bea1c2e8af9c07ccffebe112983ba64495525ee12a2d5d4
font_01_sfnt_off00006c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C87 18180 bytes
SHA-256: 1e953b72540ec4677b5f3a09436cf02581c7252e246dbe5ac414cafa51ba2d5d

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