Malicious PDF — malware analysis report

Static analysis result for SHA-256 90cd65c5c1664daf…

MALICIOUS

PDF

40.1 KB Created: 2021-04-27 11:26:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fbf9625e3b47f8a5d065429a3c37dcdd SHA-1: 1b3df947cac8fa117ebc9103b4491b9222cee993 SHA-256: 90cd65c5c1664daf0ec75c7a42b73606c7376152b4e575dc6889adb2b818ef9e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple invisible links that redirect to CAPTCHA-themed lures, aiming to trick users into visiting malicious websites. The primary URL found, https://netcdn.xyz/app/431946152/gamepasses-for-free-roblox-game-hack, suggests a lure related to game passes or hacks. The ML classifier strongly flagged this PDF as malicious, supporting the observed malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/gamepasses-for-free-roblox-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-website-survey.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-buy-anything-on-roblox-for-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-codes-that-haven-39.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-rich-roblox-passwords.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/best-free-muskets-in-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-in-roblox-2021.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-pocket-edition-free-download.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/get-roblox-r-free-on-android.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/do-you-want-tons-of-free-robux-copypasta.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-no-captcha.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_off00003da6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3DA6 26100 bytes
SHA-256: 5598fc308cb524f90d8203ccd5cd8588066785109644eb878881d73223b06c80
font_01_sfnt_off000079c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 18612 bytes
SHA-256: 46291b7677aca9bd72037bef2f951c03ceddc8afa3693638bdb7cc386a5148f0

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