Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a08bb07f6e650a…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 14:34:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 22258a3864cb237f5461a185fd0cfc14 SHA-1: 57fdd29780439b432d035a26fe97c54961260913 SHA-256: c1a08bb07f6e650ab3125a77d364c13c78a343ed7cb440a9ef2ad3ae907402d9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA or human verification prompt to trick the user into clicking a link, likely to download a malicious payload or redirect to a phishing site. The embedded URL and numerous other similar URLs found within the document suggest a campaign focused on distributing malware or facilitating scams related to in-game currencies like Robux. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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/free-robux-group-payouts-game-hack
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/robuxy-com-free-robux_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/download-coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/coin-master-hack-online-pc_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/game-hunters-coin-master-free-spins_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/master-coin-free-spin_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdf
    • https://www.spapanggilanjogja.com/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6a.bin
c88ffe220acc677b976b5554bef8f14e1e9d94d509be5cdbba31b5972aaf7efa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6A 25848 bytes
font_01_sfnt_off000085ed.bin
ce567b12c15b2d80af346f88522d5e97efe0146d8ef1a381d9680522b282c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85ED 18856 bytes

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