Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcc5e73c3a7f273…

MALICIOUS

PDF

48.5 KB Created: 2021-06-10 17:46:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 51823c837f8a9ae5039cca4d913ccc89 SHA-1: 29c55ea3d8d887eccd086b05faa136cbab0be9f9 SHA-256: 9bcc5e73c3a7f2739518a8000996fa798f936654f48eb5ad3e4b554d4d51aeee
82 Risk Score

Malware Insights

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

The sample is a PDF that displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It contains an embedded URI pointing to 'https://netcdn.tw/app/431946152/how-to-look-cool-on-roblox-free-game-hack', which likely serves as a lure to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/how-to-look-cool-on-roblox-free-game-hack
    • https://www.jjpremiers.com/files/tiktok-free-iphone_GM835599320.pdf
    • http://jjpremiers.com/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • https://www.jjpremiers.com/files/microsoft-bing-robux_GM431946152.pdf
    • http://jjpremiers.com/files/roblox-online-free_GM431946152.pdf
    • http://jjpremiers.com/files/free-robux-without-doing-anything_GM431946152.pdf
    • http://jjpremiers.com/files/websites-that-give-you-free-robux_GM431946152.pdf
    • http://jjpremiers.com/files/hacks-de-roblox-para-jailbreak_GM431946152.pdf
    • https://www.jjpremiers.com/files/aristois-minecraft-hack_GM479516143.pdf
    • http://jjpremiers.com/files/all-free-clothes-in-roblox_GM431946152.pdf
    • https://www.jjpremiers.com/files/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • http://jjpremiers.com/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://jjpremiers.com/files/coin-master-twitter_GM406889139.pdf
    • http://jjpremiers.com/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://jjpremiers.com/files/free-robux-real-2021_GM431946152.pdf
    • https://www.jjpremiers.com/files/appsmob-coin-master-hack_GM406889139.pdf
    • https://www.jjpremiers.com/files/free-lvl-10-roblox-exploit_GM431946152.pdf
    • http://jjpremiers.com/files/how-to-get-free-robux-easy_GM431946152.pdf
    • http://jjpremiers.com/files/rbxoffers-earn-free-robux_GM431946152.pdf
    • https://www.jjpremiers.com/files/coin-master-hack-spin-generator_GM406889139.pdf
    • https://www.jjpremiers.com/files/free-pets-live-in-pet-simulator-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005373.bin
8bd7145d514a4de6dd238ec0a4e6055ac71a4154fed2b7e7a3dc10a3f4212808
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5373 25612 bytes
font_01_sfnt_off00008de1.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE1 5696 bytes
font_02_sfnt_off00009af3.bin
d51436eed24437ae4aa3261f81419f719aba125372360f7d70c15e8466b2b5a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF3 18280 bytes