Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ec4a3cf95f7251…

MALICIOUS

PDF

47.0 KB Created: 2021-05-19 21:01:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c3b37dd335383f6f1701472d111796f8 SHA-1: e4ad138c1037e6dbd64e721b1b065582a60d1a83 SHA-256: 64ec4a3cf95f7251c3759c68dfe2fc44fe5c9f7ce256d420351b06dae63b4697
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The embedded URL points to a resource that likely serves as a download for a second-stage payload. No scripts were extracted, but the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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-do-you-get-free-robux-on-roblox-game-hack
    • http://fishtech.is/images/free-robux-no-verification-2021-android_GM431946152.pdf
    • http://fishtech.is/images/free-robux-images_GM431946152.pdf
    • http://fishtech.is/images/get-free-spins-coin-master_GM406889139.pdf
    • http://fishtech.is/images/coin-master-hack-quora_GM406889139.pdf
    • http://fishtech.is/images/tiktok-download-free-jio-phone_GM835599320.pdf
    • http://fishtech.is/images/earn-points-for-robux_GM431946152.pdf
    • http://fishtech.is/images/how-to-get-free-robux-com_GM431946152.pdf
    • http://fishtech.is/images/roblox-exploit-download_GM431946152.pdf
    • http://fishtech.is/images/jailbreak-roblox-hack_GM431946152.pdf
    • http://fishtech.is/images/robux-free-robux_GM431946152.pdf
    • http://fishtech.is/images/how-to-get-free-robux-hack_GM431946152.pdf
    • http://fishtech.is/images/free-robux-hack-2021_GM431946152.pdf
    • http://fishtech.is/images/free-robux-giveaway_GM431946152.pdf
    • http://fishtech.is/images/hack-coin-master-apk-2021_GM406889139.pdf
    • http://fishtech.is/images/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://fishtech.is/images/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://fishtech.is/images/free-coin-master-spin-app_GM406889139.pdf
    • http://fishtech.is/images/daily-free-spins-coin-master-heaven_GM406889139.pdf
    • http://fishtech.is/images/free-robux-no-verify_GM431946152.pdf
    • http://fishtech.is/images/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047b2.bin
48a64c46409eef585d5d6cacc279825eca7e197ebd3db84e01cb77a4aab6dec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47B2 29344 bytes
font_01_sfnt_off000089f3.bin
02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F3 2912 bytes
font_02_sfnt_off000093f0.bin
1a1edbb4620230d43f84097700922ea11c75fa5ad69815b80eb1b16329c7dce0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F0 18688 bytes

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