Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fd0937171be902…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 17:33:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3208846a212f73539da3e548e1d08252 SHA-1: d6b16344c53ff6cc10a3bc8888074dfbd9869d4c SHA-256: 55fd0937171be902736966e4d8dd872fd6d7124ff9de7aff6d346cc05a865975
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-themed and point to external resources related to game hacks and free in-game currency. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a high likelihood of malicious intent, possibly involving the download of additional payloads or redirection to phishing sites.

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/835599320/how-to-get-free-likes-on-tiktok-game-hack
    • http://rightlead.com.tw/image/data/files/how-to-roblox-script-hack_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/new-roblox-logog-gives-free-robux-robuxian_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/coin-master-hack-tool-generator_GM406889139.pdf
    • http://rightlead.com.tw/image/data/files/can-you-use-cheat-engine-on-roblox_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/free-robux-without-verification-2021_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/how-to-get-free-spins-coin-master_GM406889139.pdf
    • http://rightlead.com.tw/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://rightlead.com.tw/image/data/files/robux-free-2021_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/roblox-download-pc-free_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://rightlead.com.tw/image/data/files/robux-hack-aug-8-2021_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/coin-master-daily-free-spins_GM406889139.pdf
    • http://rightlead.com.tw/image/data/files/how-many-tiktok-free-followers_GM835599320.pdf
    • http://rightlead.com.tw/image/data/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • http://rightlead.com.tw/image/data/files/roblox-gift-card-online-free_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/roblox-account-hack-2021_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/how-to-find-roblox-hacked-servers_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/roblox-free-wings_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/roblox-bloxburg-hack_GM431946152.pdf
    • http://rightlead.com.tw/image/data/files/how-do-u-see-if-u-r-hacked-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000318f.bin
25dcf6b58838ee01636c9d40eac8de5f952f321a1ee4f0b62fd0b53741f68b42
pdf-font-stream PDF embedded font (sfnt) at offset 0x318F 22512 bytes
font_01_sfnt_off000063c7.bin
9be82b9e87c76be08840925351ca9f044162866092bd9222233490d8cf5a8306
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 18136 bytes