Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b48aea6e1722fe…

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 16:37:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 14961177f22fb762ea5b1e6133d820a7 SHA-1: 2ab3fafd7774df67d9a19d327744759fe16dc576 SHA-256: e9b48aea6e1722fe905a80b9df3581c5d7f255f26c81eccb335cf79b40932674
82 Risk Score

Malware Insights

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

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

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/431946152/google-how-do-you-get-robux-game-hack
    • http://stroygrad-spb.com/images/roblox-free-robux-website_GM431946152.pdf
    • http://stroygrad-spb.com/images/get-free-robux-info_GM431946152.pdf
    • http://stroygrad-spb.com/images/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdf
    • http://stroygrad-spb.com/images/dailyrobux_GM431946152.pdf
    • http://stroygrad-spb.com/images/robux-best_GM431946152.pdf
    • http://stroygrad-spb.com/images/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://stroygrad-spb.com/images/is-minecraft-bedrock-edition-free_GM479516143.pdf
    • http://stroygrad-spb.com/images/minecraft-free-reddit_GM479516143.pdf
    • http://stroygrad-spb.com/images/how-to-make-a-free-minecraft-account_GM479516143.pdf
    • http://stroygrad-spb.com/images/coin-master-free-spin-daily-link_GM406889139.pdf
    • http://stroygrad-spb.com/images/how-do-i-earn-robux_GM431946152.pdf
    • http://stroygrad-spb.com/images/free-robux-today_GM431946152.pdf
    • http://stroygrad-spb.com/images/robux-free-gift-card_GM431946152.pdf
    • http://stroygrad-spb.com/images/free-robux-codes-2021_GM431946152.pdf
    • http://stroygrad-spb.com/images/minecraft-hack-client-download_GM479516143.pdf
    • http://stroygrad-spb.com/images/robux-hack-generator_GM431946152.pdf
    • http://stroygrad-spb.com/images/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • http://stroygrad-spb.com/images/free-minecraft-printables-food-labels_GM479516143.pdf
    • http://stroygrad-spb.com/images/earn-robux-now_GM431946152.pdf
    • http://stroygrad-spb.com/images/200-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000482d.bin
def2c354eec121ef6083b479b3aa634e46f2587c313ecb372059b4c985afcdf7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482D 25464 bytes
font_01_sfnt_off000082ee.bin
feb1a9118afec68bc04581c8785d3317eaa63f31aad7b08e8712898c0d5a9a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82EE 18812 bytes

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