Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16c2c2a9150f834…

MALICIOUS

PDF

51.6 KB Created: 2021-06-03 10:45:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 10a2e8e8f4ab8d797962d642f8891983 SHA-1: 181d2046adf6a0b25ddaeaa0efeca9c2c01ecadf SHA-256: f16c2c2a9150f834e045bd3b4d725a421f6a071ba30261c050499f669b4dd2fa
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to deceive users into interacting with it, likely to initiate a download. The embedded URL `https://netcdn.online/app/431946152/free-robux-gift-card-codes-game-hack` is a strong indicator of a malicious lure, possibly for credential harvesting or malware distribution. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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/431946152/free-robux-gift-card-codes-game-hack
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-link-today_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-coin-master-spins-daily_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/wizard-hacks_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/get-robux-com_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-give-robux-on-mobile_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-support_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-minecraft-for-free_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-links-for-coin-master-2021_GM406889139.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/robux-in_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/add-robux_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/get-free-robux-generator_GM431946152.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/minecraft-for-macbook-free_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-vpn-for-minecraft_GM479516143.pdf
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e3.bin
5d7cf5a3df41a09d9b38237e9347d12645b940834b6f97c57f80d69224f7e8da		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E3 25296 bytes
font_01_sfnt_off00008c48.bin
f6b9a386ee4e0aff622a98b2230905da71eab0ca98398cb52018fda3528d3e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 3964 bytes
font_02_sfnt_off000099a6.bin
e59bc53cd4c0ee65dc1533becad2866f345dcb060e6c68bb8187d21cb9f973ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A6 3396 bytes
font_03_sfnt_off0000a599.bin
ab9c735b01157041a26a1754a1ceb43d7e93b9bb6de5cba43436a791952d9cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA599 18640 bytes

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