Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a90d98681e99e2…

MALICIOUS

PDF

44.8 KB Created: 2021-05-13 03:21:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4efa52b9cafb8ee13cb8d142ac23d1e8 SHA-1: cb315bc16c322f1604d380c25a213855c1d30bd3 SHA-256: d5a90d98681e99e2a48ab579207253ad983f3f75193e4218edc080e882c102d7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary external URI points to a URL associated with game hacks, suggesting the document's purpose is to facilitate the download of potentially malicious software. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/roblox-tracker-game-hack
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-pe-hack-client-ios_GM479516143.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-daily-spins-coin-master_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-coin-hack_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/instant-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-minecraft-texture-packs-java_GM479516143.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coinmaster_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-2021-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-safe_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-2021_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/robux-free-c_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-java-free-download_GM479516143.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-download_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-free-play-no-download_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/where-to-get-free-robux_GM431946152.pdf
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bb0.bin
9a1e16051623b0fb08810c572e31192827ce9cc44ec267620503222e35f7db31
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB0 28932 bytes
font_01_sfnt_off00008cef.bin
72f8522d23e1124dd8ed7fdd7308c58d02d03d2ede9b00fcb85fd7d8fd1c97df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEF 18184 bytes