Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4b63ad412b2c4b…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 13:17:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8743f4c6be7e58605025a0aab09a7cb1 SHA-1: 4848621cfdc59d49405537e1f1b170288966790a SHA-256: 5f4b63ad412b2c4bdddbcc8db64b3672680e72a7307e715021afc25c34e39f33
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as a link farm for SEO-related PDF files. The primary URL, http://netcdn.tw/app/479516143/wurst-game-hack, suggests a lure for game-related cheats or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent to trick users into downloading further content. No scripts were extracted, but the overall structure and linked content 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.tw/app/479516143/wurst-game-hack
    • http://gazelletr.com/userfiles/files/coin-master-free-spins-generator_GM406889139.pdf
    • http://gazelletr.com/userfiles/files/boku-no-roblox-remastered-money-free_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/coin-master-daily-free-spins_GM406889139.pdf
    • http://gazelletr.com/userfiles/files/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdf
    • http://gazelletr.com/userfiles/files/roblox-free-robux-hack-penguinson_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/roblox-catalog-free_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/boost9-com-roblox-hack_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/roblox-hack-cilent-2021_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/cheat-roblox-all-games_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/card-hack-in-coin-master_GM406889139.pdf
    • http://gazelletr.com/userfiles/files/free-robux-app_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/robux-hack-free-no-verify_GM431946152.pdf
    • http://gazelletr.com/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdf
    • http://gazelletr.com/userfiles/files/can-you-get-minecraft-for-free_GM479516143.pdf
    • http://gazelletr.com/userfiles/files/free-tiktok-video_GM835599320.pdf
    • http://gazelletr.com/userfiles/files/coin-master-rewards-2021_GM406889139.pdf
    • http://gazelletr.com/userfiles/files/free-coins-coin-master-blog_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032a6.bin
7ee7ae87b52732bbcacad317b1fc06e48f4549d45f2284b7cc62f134c7e6f906
pdf-font-stream PDF embedded font (sfnt) at offset 0x32A6 22084 bytes
font_01_sfnt_off00006350.bin
bfe640fece8ec17f9f1aab4c59e3302c849608263b50329376eef2517c23199e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6350 18072 bytes