Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc61af2f837b501…

MALICIOUS

PDF

226.8 KB Created: 2021-07-09 07:46:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 39cfe0084c664cd0438c15f68d54ed66 SHA-1: bf744b1cbacacad0c5006e7cc1c289da2951a967 SHA-256: fdc61af2f837b5018a1663b68d46ce0413502f3d3b01e1826a30dd76dc80f00b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA and a call-to-action button, aiming to trick the user into downloading a file, likely a malicious payload. The embedded URL points to a resource offering game hacks, a common lure for social engineering. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to redirect the user to download potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/pokemon-go-free-zoom-game-hack
    • https://www.jjpremiers.com/files/freerobuxvbucksexe_GM431946152.pdf
    • https://www.jjpremiers.com/files/hacks-to-get-free-robux_GM431946152.pdf
    • https://www.jjpremiers.com/files/free-coin-master-spins-no-verification_GM406889139.pdf
    • http://jjpremiers.com/files/robux-fun-hack_GM431946152.pdf
    • https://www.jjpremiers.com/files/free-lvl-10-roblox-exploit_GM431946152.pdf
    • http://jjpremiers.com/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://jjpremiers.com/files/robux-free-no-vertifacation_GM431946152.pdf
    • http://jjpremiers.com/files/coin-master-app-free-download_GM406889139.pdf
    • https://www.jjpremiers.com/files/coin-master-free-spins-iphone_GM406889139.pdf
    • https://www.jjpremiers.com/files/coin-master-hacks-for-cards_GM406889139.pdf
    • http://jjpremiers.com/files/minecraft-mods-download-free_GM479516143.pdf
    • http://jjpremiers.com/files/free-minecraft-java-account_GM479516143.pdf
    • https://www.jjpremiers.com/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://jjpremiers.com/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdf
    • https://www.jjpremiers.com/files/coin-master-free-spins-app_GM406889139.pdf
    • https://www.jjpremiers.com/files/free-robux-no-scam-no-human-verification-2021_GM431946152.pdf
    • https://www.jjpremiers.com/files/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://jjpremiers.com/files/earn-robux-com_GM431946152.pdf
    • http://jjpremiers.com/files/coin-master-free-spins-2021_GM406889139.pdf
    • https://www.jjpremiers.com/files/free-robux-only-1-step_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_023_off0003205b.bin
85bc23c6656714e738b8091a5319452fc8cbc1dfb53877892dab251b662f92f8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3205B 25576 bytes
font_01_sfnt_off00035c60.bin
fa7e82bf4d2d9d9f31bfb93c172d68aee85d72b25d3f929f566e7c1915b9023b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35C60 18452 bytes

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