Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc911318b53657b…

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 11:12:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: be62d1ac59d4c646dfa0b4ae588a4ac6 SHA-1: 51246413901580ff63a547f06abc403f9864e387 SHA-256: 9bc911318b53657ba8ba00a1ced45929e1e356c90d0c32b52de75fb39ffa6b00
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into downloading malicious content. It contains an embedded URI pointing to a suspicious URL, likely intended to serve a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/835599320/free-tiktok-fans-no-verification-game-hack
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-free-blogspot_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/pubg-uc-redeem-code_GM1330123889.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-hack-coin-master-without-root_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app-download_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-free-download-app_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/roblox-tracker_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/minecraft-pocket-edition-mods-for-free_GM479516143.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-robux-obby_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/hack-coin-master-no-survey_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/create-minecraft-server-free_GM479516143.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/50-free-tiktok-likes-trial_GM835599320.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-robux-microsoft_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-spins_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/easypoints-gg-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f60.bin
93ed4e0f5795bd4783ac77ffff3dd6885b852faaa5fc3c03aa7638036810ba0c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F60 24248 bytes
font_01_sfnt_off00008717.bin
db30cff21771a834018d301e3e15668d4f696dd14c251b75c79f93eed26cd5f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8717 17816 bytes

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