Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b50f5c724db39f…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 07:51:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 11b45f918bafe2e3844e59150e2c228f SHA-1: 550b5a2e3044515f5d2e7fcec04ea9981e2b7217 SHA-256: 66b50f5c724db39fd18df5e531f4b945d051a9159a80d7e4e6f10190be193bcc
82 Risk Score

Malware Insights

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

The ML classifier and fake CAPTCHA heuristic strongly indicate malicious intent. The document body and embedded URLs suggest a lure for free game currency or cheats, likely leading to a malicious download or phishing site. No scripts were extracted from this sample, limiting the analysis of specific execution chains.

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 http://netcdn.co/app/431946152/how-to-get-free-robux-at-computer-game-hack
    • http://www.manchieu.vn/upload/editor/files/roblox-free-no-download_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-robux-no-human-verification_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/minecraft-free-download-android-apk-014-0_GM479516143.pdf
    • http://www.manchieu.vn/upload/editor/files/roblox-cheat-engine-speed-hack-2021_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/master-free-spin_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-hack-injection_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-link-spin_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/minecraft-java-edition-free_GM479516143.pdf
    • http://www.manchieu.vn/upload/editor/files/free-games-like-coin-master_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/roblox-free-robux-games-that-work-2021_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/como-hackear-coin-master-espaol_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/free-roblox-injector-v3rmillion_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/free-minecraft-server-hosting-24-7_GM479516143.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-hack-spins_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/free-robux-no-verification-no-download_GM431946152.pdf
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-spins-cheat-deutsch_GM406889139.pdf
    • http://www.manchieu.vn/upload/editor/files/robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003016.bin
7a67c7a4ad0435cdbee79bed59eaccc8f0d9fab0639b3ddb0e23846e673d98e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x3016 22848 bytes
font_01_sfnt_off0000634c.bin
9055ffcab99174f55bc90faafe5df47cf1b1ecb05980fad24642f623bed33637
pdf-font-stream PDF embedded font (sfnt) at offset 0x634C 19420 bytes