Malicious PDF — malware analysis report

Static analysis result for SHA-256 6639cf082a4b6ed6…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 14:17:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b479546af7ce0155462eba61dcdc5023 SHA-1: 22e6b19f65e5afd6202cbe50c9294e799da3e632 SHA-256: 6639cf082a4b6ed65037a38a3295731cbed860b2208c3a7459a88df1c0092369
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on domains related to digital libraries but contain SEO-optimized slugs for game hacks and cheats. The document body explicitly mentions 'Free Robux Apps That Work' and includes a download button lure, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

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.tw/app/431946152/free-robux-apps-that-work-game-hack
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-other-pples-stuff-on-roblox-mm2_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-easy-and-fast-on-computer_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-app-2021_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-money-jailbreak_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox-on-mobile_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-really-hack-coin-master_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-tiktok-famous-free_GM835599320.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-spin-coin-master-game_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/roblox-polo-ralph-lauren-free-shirt_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-through-coin-pop_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/huskybuckscom-free-robux_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/roblox-source_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://digilib.ulm.ac.id/pusat/repository/free-promo-codes-for-roblox-2021-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003136.bin
7107168f28392393f211a68acad320a27ac06cd49d3a36920759b12a731e36d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3136 22268 bytes
font_01_sfnt_off0000629e.bin
3ce59685ce564c47d51d5d1714b73889d1d344349ceb90d9e3a1730e11095f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 19528 bytes

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