Malicious PDF — malware analysis report

Static analysis result for SHA-256 e827d016abac89bd…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 07:11:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5a014d0c4e8303e0463440a3331709db SHA-1: e36aa95488d873c45d3ead35608a49d827b34eb0 SHA-256: e827d016abac89bd34381c3229e9db78276477e78048d59ddde13212a51e1214
82 Risk Score

Malware Insights

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

The document presents itself as a download for game cheats, but contains a fake CAPTCHA to trick the user into interacting with it. It embeds multiple URLs, including one pointing to a potential executable disguised as a PDF, which likely serves as a lure to download a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/aimbot-hack-roblox-phantom-forces-game-hack
    • http://www.elsire.co.in/uploaded_files/userfiles/files/huskybuckscom-free-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/john-doe-roblox-hacker_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/mcpe-download_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-hack-apk-android_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/robux-hack-free-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/minecraft-free-demo_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/get-free-bird-toy-code-roblox_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/www-roblox-cheats-com_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/pubg-2021-uc-glitch_GM1330123889.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-site_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/minecraft-free_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-a-lot-of-robux-for-free-2021_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/download-minecraft-bedrock_GM479516143.pdf
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-foxy-food-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000506c.bin
2dc8c975cab68458623d40c60f262b6af52d0491bdae1b0ce29f6936d814afb0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x506C 26456 bytes
font_01_sfnt_off00008d87.bin
d224486f1e96490b712997a71cb8c3c67fba69badd7e26e2196e7aa3ece1702f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 19152 bytes

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