Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cd392c852182a3…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 05:06:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bbfe57b25b98225d256335dfdff175fe SHA-1: 466293956bb7c88a95e712591c2d9989559866cf SHA-256: 21cd392c852182a39d33c3437572c509ad1fc70293c4f69dddafcc9f9a5498ba
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are SEO-optimized to appear as legitimate links for game hacks and cheats, suggesting a lure for users to download malicious content. The presence of a 'download button' heuristic further supports this malicious intent. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/big-head-roblox-hack-game-hack
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-hack-2021_GM406889139.pdf
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-without-verification_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/free-knives-in-assassin-roblox_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/roblox-redeem-card-codes-free_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/rbxcity-free-robux_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-giveaway-live_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://pustaka.faterna.unand.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/earn-robux-by-watching-ads_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/roblox-free-80-robux_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://pustaka.faterna.unand.ac.id/repository/is-hacking-roblox-a-crome_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/is-it-possible-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-no-verification-required_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/free-tiktok-followers-and-likes_GM835599320.pdf
    • http://pustaka.faterna.unand.ac.id/repository/free-robux-and-tix-tricks-amp_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/roblox-weight-lifting-simulator-how-to-hack-stats_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://pustaka.faterna.unand.ac.id/repository/how-to-use-hacks-on-roblox-pet-sim-2_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003146.bin
ebff8ea7b07a2d71660a97c6faa2970aef18a54d245b39a3b5a2a00d723d366e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3146 22844 bytes
font_01_sfnt_off000063f6.bin
ad9fe98094107cf66a4d13f617715d410194f39e21c0d3db294148b6a3537baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F6 18952 bytes

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