Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9d92839c7a78ab…

MALICIOUS

PDF

35.2 KB Created: 2021-06-21 15:55:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 840f3c1382ad965dbb6593e1854e46a4 SHA-1: ae3f059bd3221f986bdcbdee189eb46ed57a5c69 SHA-256: af9d92839c7a78abd7ac215bcd5a827f3ef76f345484f5a22323f5a6aa32f1a1
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate downloads for game-related cheats and currency. The primary URL, http://netcdn.co/app/431946152/free-robux-2021-no-waiting-instant-no-inspect-game-hack, and the extensive link farm hosted on torkelson.se suggest a lure for users seeking free in-game items, likely leading to malware or unwanted applications. The ML classifier strongly supports the malicious nature of this PDF.

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/free-robux-2021-no-waiting-instant-no-inspect-game-hack
    • http://torkelson.se/images/free-minecraft-windows-10-with-java_GM479516143.pdf
    • http://torkelson.se/images/free-unused-roblox-codes_GM431946152.pdf
    • http://torkelson.se/images/how-to-get-free-robux-website_GM431946152.pdf
    • http://torkelson.se/images/free-coin-master-spins-no-human-verification_GM406889139.pdf
    • http://torkelson.se/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdf
    • http://torkelson.se/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdf
    • http://torkelson.se/images/how-to-find-free-clothes-on-roblox_GM431946152.pdf
    • http://torkelson.se/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://torkelson.se/images/roblox-hack-client-april-2021_GM431946152.pdf
    • http://torkelson.se/images/free-tiktok-fans-no-verification_GM835599320.pdf
    • http://torkelson.se/images/how-to-hack-super-simon-says-on-roblox_GM431946152.pdf
    • http://torkelson.se/images/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://torkelson.se/images/hack-roblox-games-2021_GM431946152.pdf
    • http://torkelson.se/images/coin-master-hack-with-lucky-patcher_GM406889139.pdf
    • http://torkelson.se/images/free-coin-master-cheats_GM406889139.pdf
    • http://torkelson.se/images/roblox-credit-card-free_GM431946152.pdf
    • http://torkelson.se/images/how-to-earn-free-robux_GM431946152.pdf
    • http://torkelson.se/images/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • http://torkelson.se/images/roblox-store-free_GM431946152.pdf
    • http://torkelson.se/images/free-robux-games_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003164.bin
5f38f54b66b0b2c5d287ab980197983034593b08cc15db989cb5e070c4eaa8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x3164 22064 bytes
font_01_sfnt_off00006243.bin
cc9b2fa06f70dc5727da1896621486fdffda85245ab9e470c748eccd1b6ebd96
pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 19716 bytes