Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c0a89e4766639e…

MALICIOUS

PDF

34.7 KB Created: 2021-06-17 21:19:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ec9c71885f0bba50cb8f3526fc87a8bc SHA-1: 4db465987c2ffa7a41dea1363a92a76c2d400e25 SHA-256: a4c0a89e4766639eec73ffbcc96a63e553e4210788072b133fb433751a2e60fd
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are structured as SEO-optimized links to other PDF files, suggesting a link farm designed to attract users searching for game cheats and free in-game items. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a 'download button' heuristic further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

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/does-cheat-engine-even-work-anymore-for-roblox-game-hack
    • http://killebergsridsport.se/images/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://killebergsridsport.se/images/free-robux-rapido_GM431946152.pdf
    • http://killebergsridsport.se/images/roblox-retail-tycoon-xbox-one-cheats_GM431946152.pdf
    • http://killebergsridsport.se/images/roblox-free-credit-card_GM431946152.pdf
    • http://killebergsridsport.se/images/minecraft-pe-texture-packs-free-download_GM479516143.pdf
    • http://killebergsridsport.se/images/roblox-nopede-egine-hacks_GM431946152.pdf
    • http://killebergsridsport.se/images/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://killebergsridsport.se/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdf
    • http://killebergsridsport.se/images/free-spins-coin-master-legit_GM406889139.pdf
    • http://killebergsridsport.se/images/coin-master-free-spin-codes_GM406889139.pdf
    • http://killebergsridsport.se/images/coin-master-hack-online-download_GM406889139.pdf
    • http://killebergsridsport.se/images/minecraft-rtx-download-free_GM479516143.pdf
    • http://killebergsridsport.se/images/roblox-com-free_GM431946152.pdf
    • http://killebergsridsport.se/images/coin-master-hack-pc_GM406889139.pdf
    • http://killebergsridsport.se/images/free-daily-spins-coin-master_GM406889139.pdf
    • http://killebergsridsport.se/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • http://killebergsridsport.se/images/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://killebergsridsport.se/images/how-to-create-group-in-roblox-for-free_GM431946152.pdf
    • http://killebergsridsport.se/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://killebergsridsport.se/images/tiktok-vs-free-fire_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003015.bin
32ba03df7c8da750ab6e8d6db119c26d03ab5524cb3dbe3437395f718c17a0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x3015 21800 bytes
font_01_sfnt_off00005ff4.bin
4b5be0a901b9ade605c753517eb1de317a0c6e93e7e46f458f25d89556f997c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF4 19944 bytes