Malicious PDF — malware analysis report

Static analysis result for SHA-256 753de8cf76e07539…

MALICIOUS

PDF

48.0 KB Created: 2021-06-02 21:50:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ff754c7c5ce7ccfb0ba6bd86435ef968 SHA-1: aae468de60d246aebac8bab1c6d2df73bd545bf2 SHA-256: 753de8cf76e0753950efd4259db950c7ca9607555ec5c8e4e02780c00d029ca9
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA heuristic, indicating a social engineering attempt to trick the user. It also includes an embedded URI pointing to a URL that promises free Robux, a common lure for malicious downloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-get-free-robux-without-downloading-app-game-hack
    • https://www.summerland.com.tw/upload/files/free-coin-master-cards_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/10-free-spins-coin-master_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/roblox-premium-free_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/buy-tiktok-likes-free_GM835599320.pdf
    • https://www.summerland.com.tw/upload/files/how-to-get-free-roblox_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/best-minecraft-hacked-client-2021_GM479516143.pdf
    • https://www.summerland.com.tw/upload/files/minecraft-pe-free-apk_GM479516143.pdf
    • https://www.summerland.com.tw/upload/files/coin-master-hack-program_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/roblox-script-hack_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/roblox-play-as-guest-free_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/coin-spin-link_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/free-minecraft-coins_GM479516143.pdf
    • https://www.summerland.com.tw/upload/files/free-robux-sites-that-work_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/free-shirt-roblox_GM431946152.pdf
    • https://www.summerland.com.tw/upload/files/free-spin-coin-master-link-2021_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/coin-master-online-hack-2021_GM406889139.pdf
    • https://www.summerland.com.tw/upload/files/rbxfree-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f6d.bin
67f53885b4d8da929548e96160aad1c2c2c6f765a7fd06599c3f761b6437a4fd
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F6D 25472 bytes
font_01_sfnt_off00008a3f.bin
db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3F 2828 bytes
font_02_sfnt_off000093f6.bin
0d67f10a5f2db8d122ca9e299763bdeb8e187c55064af03663e12c9e07b8ef47
pdf-font-stream PDF embedded font (sfnt) at offset 0x93F6 19876 bytes