Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fa9c5b7ab8870b…

MALICIOUS

PDF

41.8 KB Created: 2021-05-15 17:42:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 93850a3fcda1456cf1152d7dea34f241 SHA-1: 535172fc147bf1d3a7406de6b7ca5e05157c0f41 SHA-256: a4fa9c5b7ab8870bab75cdddfed9937d26bbc5c2fa7d90962182c7c8f7429c35
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/431946152/roblox-online-free-game-hack PDF link annotation
    • https://creationegyptco.com/userfiles/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-do-you-get-roebucks_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_off0000488d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488D 24632 bytes
SHA-256: d9af47009cd43bd04c814bc9a6882fd00dd63658decb04435bb752eda46bbd3d
font_01_sfnt_off0000819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 18068 bytes
SHA-256: 065eb5bea139eaf43a54c15370d64aa119270a6f111c6de0f976a0e20a38860d

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