Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6b193eae1ca417…

MALICIOUS

PDF

41.6 KB Created: 2021-05-17 19:14:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5cae92bf26469cac9be916869ed358cc SHA-1: 866538fe9655e04e5d36e8a125551733ca5d952c SHA-256: ae6b193eae1ca4172a9ae61c48d4f5d07d54ffdf55493fe9800e982afa9ed74c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick users into downloading a tool, as indicated by the 'SE_FAKE_CAPTCHA' heuristic and the embedded URL pointing to a 'coin-master-hack-tool'. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a second-stage payload, likely involving exploitation for client execution. The primary IOC is the URL leading to the purported hack tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-tool-v1-9-game-hack
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-no-human-verification_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-free-pets_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-free-robux-codes_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-mighty-lion-card_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-hack-ga_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/minecraft-hack-client-download_GM479516143.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/who-to-get-free-robux_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-spins-link-2021-no-verification_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/get-more-free-spins-on-coin-master_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/where-can-i-get-free-coins-for-coin-master_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/fb-coin-master-hack_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-food_GM406889139.pdf
    • https://www.tvoyo.tv/ckfinder/userfiles/files/claim-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000480b.bin
aba4b4490599f4b74dbc4be82e5dcbbbd58f5139b3c5d7a6d197fedfc906e1a9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480B 24824 bytes
font_01_sfnt_off00008072.bin
948bfbd28f908060b86a9c4a078f031a0a7b6f349e372fe1328e9069b1b47d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8072 18196 bytes