Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc85316680dcbc69…

MALICIOUS

PDF

44.2 KB Created: 2021-06-08 10:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af04c99eb84ceaa20515062811fecff1 SHA-1: d2cae1636b2618f2b069e8e7477cde1a70272d9d SHA-256: cc85316680dcbc6973502981cfa9c8692b509b632c07871910c4b80d3330140d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA and a call-to-action button, aiming to trick the user into clicking a link. The embedded URL, https://netcdn.tw/app/431946152/free-roblox-accounts-with-robuzx-game-hack, likely leads to a second-stage payload download. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-roblox-accounts-with-robuzx-game-hack PDF link annotation
    • https://www.wco.org.uk/uploads/files/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-roblox-games-yow-can-make_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-code-for-free-spins_GM406889139.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_004_off00005045.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5045 24500 bytes
SHA-256: f96243f8313aae956557ba074ede0e3cf230f4f2f8890b786f8cd41385f914a3
font_01_sfnt_off0000889f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889F 18756 bytes
SHA-256: baed64c4b1f51c12aa4a7dc240b09da3f99cf9e7a0361acbdf69a7db929e7adf

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