Malicious PDF — malware analysis report

Static analysis result for SHA-256 85178db7599d421a…

MALICIOUS

PDF

44.4 KB Created: 2021-06-04 04:05:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 061b80e5e26d115664a6fdac2618827a SHA-1: fe781d29ec8f7112b1c9ac29e42f40fa0c561477 SHA-256: 85178db7599d421a17fcfa2fe3a58839033026241c51f529f6eaf650bb7a7ad1
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links. The document also presents a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The primary URL, 'https://netcdn.online/app/431946152/free-robux-codes-game-hack', suggests a scam related to in-game currency. No scripts were extracted, but the PDF structure and embedded links indicate a phishing or scam attempt, likely leading to a second-stage download or exploit.

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-codes-game-hack
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-apple_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/block-best-robux_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/minecraft-free-download-linux_GM479516143.pdf
    • http://library.fk.upnvj.ac.id/repository/hack-coin-master-without-human-verification_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/free-robux-accounts_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/free-robux-com-no-verification_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/roblox-sexually-abused_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/minecraft-win-10-free_GM479516143.pdf
    • http://library.fk.upnvj.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdf
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-100-working_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/moonactive-free-spins_GM406889139.pdf
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005037.bin
cac3384d95633d6b3bafc8fa0290c6630712605d4c5c4a29ee8fe7dabfb0a215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5037 26032 bytes
font_01_sfnt_off00008b42.bin
7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B42 18188 bytes

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