Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c65c7f1185eb947…

MALICIOUS

PDF

52.5 KB Created: 2021-06-10 22:46:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7cd71d29f73c74f00f908c7e62943e42 SHA-1: 40a3b53510de160980e6398fce42944d670cb8e3 SHA-256: 7c65c7f1185eb94702bc7a6443e1bf4f16726c87d9f7f501931bfc495cab2271
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.tw/app/431946152/free-robux-codes-giveaway-game-hack, likely leads to a second-stage payload download. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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/free-robux-codes-giveaway-game-hack
    • http://opac.stieimalang.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdf
    • http://www.opac.stieimalang.ac.id/repository/village-3-coin-master_GM406889139.pdf
    • http://www.opac.stieimalang.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdf
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://www.opac.stieimalang.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • http://www.opac.stieimalang.ac.id/repository/is-pokemon-free_GM1094591345.pdf
    • http://opac.stieimalang.ac.id/repository/free-robux-without-verification_GM431946152.pdf
    • http://www.opac.stieimalang.ac.id/repository/free-domain-for-minecraft-server_GM479516143.pdf
    • http://www.opac.stieimalang.ac.id/repository/roblox-btools-hack-2021-october_GM431946152.pdf
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://opac.stieimalang.ac.id/repository/coin-master-offline-hack_GM406889139.pdf
    • http://www.opac.stieimalang.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.opac.stieimalang.ac.id/repository/how-to-earn-free-robux_GM431946152.pdf
    • http://www.opac.stieimalang.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdf
    • http://opac.stieimalang.ac.id/repository/roblox-goradiel-rpg-4-hacked_GM431946152.pdf
    • http://www.opac.stieimalang.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://www.opac.stieimalang.ac.id/repository/how-to-download-wurst_GM479516143.pdf
    • http://opac.stieimalang.ac.id/repository/free-coins_GM406889139.pdf
    • http://opac.stieimalang.ac.id/repository/minecraft-games-online-free-no-download_GM479516143.pdf
    • http://www.opac.stieimalang.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005475.bin
09a3662570d19d83557b1e1ecf65d670ad7694c0b58c04662e80291d021b4b0e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5475 38568 bytes
font_01_sfnt_off0000a90b.bin
20b239ccae76f909bf62226e3b644de58e7b9ce7a6d395e408d754effc79d547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA90B 18992 bytes

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