Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae86cb91bf03e3c…

MALICIOUS

PDF

47.8 KB Created: 2021-06-08 22:35:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a3f7e534f4faede9d6b92f5e50090eef SHA-1: 89b752de66d3b9dc02faaff0f431dff6455a96ea SHA-256: 4ae86cb91bf03e3ca749a1c04ec0dd5661482fb8402ba248f8fc368a77756fbb
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a link. This link, 'https://netcdn.tw/app/431946152/roblox.com-how-to-get-free-robux-only-today-adverts-game-hack', likely leads to a site that hosts further malicious content or exploits. The presence of numerous external links also suggests a link farm intended to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox.com-how-to-get-free-robux-only-today-adverts-game-hack
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-to-get-free-hats-on-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/where-can-i-get-free-coins-for-coin-master_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-printable-roblox-images_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/roblox-games-com-free_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-free-spins-cheat_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-free-coins-facebook_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-free-spins-link-download_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-to-get-2021-robux-for-free_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/without-tiktok-free-view-iphone-11_GM835599320.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/2021-free-spins-coin-master-link_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/how-do-you-hack-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/all-free-items-in-roblox_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/free-robux-not-fake_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/pubg-uc-and-generator_GM1330123889.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/como-generar-coin-master-free-spins_GM406889139.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/robux-free-promo-codes_GM431946152.pdf
    • http://pustaka.ditjenpkh.pertanian.go.id/pusvetma/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005511.bin
0332d61e15398b762a2f71a24057b41af7cc6ddbed6e856cc6a7af1361595783		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5511 27564 bytes
font_01_sfnt_off000094ff.bin
aa20672e92a70c6eb8e6fa8e1a723f7ec3a23197f67fcff818ef43911e1b120f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94FF 19380 bytes

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