Malicious PDF — malware analysis report

Static analysis result for SHA-256 53976eeedfeae3c3…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 15:38:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 20f7d4535fd00acc54ab0910575baf4b SHA-1: b0709ba76c2735995372055d7384072fe044b0d1 SHA-256: 53976eeedfeae3c3c8286704a2f6641a44866f8b209c8f2da218228d42e1af95
82 Risk Score

Malware Insights

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

The document contains a fake CAPTCHA lure, which is a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URLs, one of which is directly linked to a potential payload download. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/google-how-do-you-get-robux-game-hack
    • http://library.ulb.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdf
    • http://library.ulb.ac.id//repository/free-robux-hacker-us_GM431946152.pdf
    • http://library.ulb.ac.id/repository/to-get-free-robux_GM431946152.pdf
    • http://library.ulb.ac.id//repository/coin-master-cheats-2021_GM406889139.pdf
    • http://library.ulb.ac.id//repository/easy-how-to-get-free-robux_GM431946152.pdf
    • http://library.ulb.ac.id//repository/coin-master-gold-cards-free_GM406889139.pdf
    • http://library.ulb.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdf
    • http://library.ulb.ac.id//repository/hack-coin-master-no-human-verification_GM406889139.pdf
    • http://library.ulb.ac.id//repository/minecraft-gun-games-free_GM479516143.pdf
    • http://library.ulb.ac.id//repository/free-coin-master-spins_GM406889139.pdf
    • http://library.ulb.ac.id//repository/free-spins-coin-master-links-twitter_GM406889139.pdf
    • http://library.ulb.ac.id//repository/coin-master-codes_GM406889139.pdf
    • http://library.ulb.ac.id//repository/how-to-hack-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id//repository/free-robux-glitch-2021_GM431946152.pdf
    • http://library.ulb.ac.id//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id//repository/how-to-free-robux_GM431946152.pdf
    • http://library.ulb.ac.id//repository/minecraft-112-2-hacked-client_GM479516143.pdf
    • http://library.ulb.ac.id//repository/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://library.ulb.ac.id/repository/coin-master-daily-free-spins-link-app-download_GM406889139.pdf
    • https://rblx.land
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000491e.bin
2deb60cd6e4db59ae429b03c42809ebe0e17ab1225f3fc2d3962b8b23b5c2f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x491E 25968 bytes
font_01_sfnt_off000084ef.bin
feb1a9118afec68bc04581c8785d3317eaa63f31aad7b08e8712898c0d5a9a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EF 18812 bytes

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