Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65932c9667d74a6…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 00:36:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e04c46f860087374f5c0d1e9c83f2a20 SHA-1: dc646c5165cd833276f930bcf1e332a37248d8be SHA-256: b65932c9667d74a61d2b3ea2ef84164d20154376e5a7e58fb7aff8747d5dc659
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document employs a fake CAPTCHA lure to deceive users into downloading a potentially malicious application from the provided URL. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-hack-app-android-download-game-hack, is the primary indicator of malicious intent. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to facilitate a download, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/406889139/coin-master-hack-app-android-download-game-hack PDF link annotation
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-dungeons-download-free_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F0 25356 bytes
SHA-256: 032eca82ff40158b525057d8ee62c8d76625a5be6a34d05dec89a65827f94f67
font_01_sfnt_off000084b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B5 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 18472 bytes
SHA-256: ce710c1ea70bd19d40b451a7d18c4a8a6d5bae3786b43e0834e6491f7024c8b0

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