Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b31bf77f7f3f5b4…

MALICIOUS

PDF

34.2 KB Created: 2021-06-27 21:26:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e57c95c4aa16783311f8ff87b6a6b75a SHA-1: 4ab7cfec1f0033e8a9200e0f9cbd3f5a3b697582 SHA-256: 7b31bf77f7f3f5b4f1a71d28cd0ef072a958f0971c3f350f0fd417071ade7caf
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into downloading a malicious executable, likely disguised as a game hack. The embedded URL http://netcdn.co/app/431946152/for-roblox-launch-for-free-vip-game-hack is a primary indicator of the malicious payload's origin. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/for-roblox-launch-for-free-vip-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/enter-this-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-free-robux-points_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-add-free-robux-to-your-account_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/ho-wto-hack-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-hack-the-plaza-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/grab-knife-hack-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-obc-robux-inspect-element_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/yt-how-download-script-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-get-free-robux-no-hacks-2021-in-seconds_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/dragonball-n-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/how-to-ban-or-kick-in-servers-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/hack-roblox-egg-farm-simulator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3086 21484 bytes
SHA-256: 835a9b0cdcce90e10afbad2dbd84ec1d701dae6a247cc908cffb8806f7bcd200
font_01_sfnt_off00005fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAE 19384 bytes
SHA-256: 0d42cdd8660d9c61606fa80b87c7e0bff0b1ca64986c1cb9e92fc230b76c30e7

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