Malicious PDF — malware analysis report

Static analysis result for SHA-256 75218863013cb661…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 04:06:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a544f8f4c77499ef629b4091ae20c0b8 SHA-1: a0632cef87259ae6b2fc183b9abd982061d3f8d7 SHA-256: 75218863013cb661a39d0bfa06028874286f3a2bfe44d87983e71587493f1b3c
80 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains invisible links and a call-to-action phrase, strongly suggesting a lure to a malicious website. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous URLs pointing to potentially malicious content indicates a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 3

  • 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
  • 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-robux-no-captcha-or-human-verification-game-hack
    • http://kukuck.de/images/minecraft-free-android_GM479516143.pdf
    • http://kukuck.de/images/can-you-give-me-robux_GM431946152.pdf
    • http://kukuck.de/images/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://kukuck.de/images/coin-master-daily-free-spin-app_GM406889139.pdf
    • http://kukuck.de/images/free-old-roblox-accounts_GM431946152.pdf
    • http://kukuck.de/images/pubg-uc-price-in-nepal_GM1330123889.pdf
    • http://kukuck.de/images/gameoffice-net-hack-coin-master_GM406889139.pdf
    • http://kukuck.de/images/free-robux-accounts-2021_GM431946152.pdf
    • http://kukuck.de/images/free-robux-codes-no-verification_GM431946152.pdf
    • http://kukuck.de/images/coin-master-free-spins-2021-apk_GM406889139.pdf
    • http://kukuck.de/images/wurst-18-9_GM479516143.pdf
    • http://kukuck.de/images/free-robux-generator-no-verification_GM431946152.pdf
    • http://kukuck.de/images/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://kukuck.de/images/tower-of-hell-roblox-hack_GM431946152.pdf
    • http://kukuck.de/images/minecraft-ps4-free_GM479516143.pdf
    • http://kukuck.de/images/coin-master-game-hacking_GM406889139.pdf
    • http://kukuck.de/images/coin-master-coins-hack_GM406889139.pdf
    • http://kukuck.de/images/roblox-help-free-robux_GM431946152.pdf
    • http://kukuck.de/images/roblox-apk-hack_GM431946152.pdf
    • http://kukuck.de/images/robux-free-c_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e5c.bin
398f495ba6cc2bfea62b4dfca98a400ef72ca3efe13fdb9630bba7be2d9c5a3d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E5C 29020 bytes
font_01_sfnt_off0000905a.bin
c41561030fd153ff873e174c02f564fabee2a749c0ba4c3902d1401f5d49d2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x905A 19204 bytes

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