Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdb99c1cdd41039…

MALICIOUS

PDF

43.1 KB Created: 2021-06-04 04:21:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7d38e01d514e4d81d190fe89cbf521a6 SHA-1: aac3b337b9264ff71f49b65e20f2d53fe68602eb SHA-256: 8bdb99c1cdd4103988b9aae92122bc9cf1bfd54a9cb43ad61d7c1bc5bcf88f26
142 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious lure, including a fake CAPTCHA prompt designed to trick users into interacting with the document. It contains numerous external links, many pointing to SEO-optimized PDF documents, suggesting a link farm or content-scraping operation. The primary external URL, https://netcdn.online/app/431946152/free-robux-giveaway-live-game-hack, is likely a distribution point for a secondary payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-giveaway-live-game-hack
    • https://digilib.stieama.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/hack-the-game-coin-master_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/can-pokemon-go-free-evolve-after-trade_GM1094591345.pdf
    • https://digilib.stieama.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • https://digilib.stieama.ac.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdf
    • https://digilib.stieama.ac.id/repository/coinmaster-free-cards_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/get-free-robux-no-verification_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/robux-free-c_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdf
    • https://digilib.stieama.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/coin-master-reward-link_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdf
    • https://digilib.stieama.ac.id/repository/microsoft-rewards-robux_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/how-pubg-uc-hack_GM1330123889.pdf
    • https://digilib.stieama.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • https://digilib.stieama.ac.id/repository/coin-master-hack-club_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004bd3.bin
b56282a96f1587b248b1b4103ed7e0a339660e3e49331c26565deeea8cb637fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD3 24752 bytes
font_01_sfnt_off00008421.bin
3db94d24ba3abe2bdb9d310b65f8480e65e9005ffe127367b6d2ef8ae08c9d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8421 18820 bytes

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