Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f99b0850725c3a9…

MALICIOUS

PDF

48.1 KB Created: 2021-06-09 08:40:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3307552b74837a3fa5e861b194aac310 SHA-1: 9722c5ed4836d7e4e71652b11181c7a5696e37cf SHA-256: 8f99b0850725c3a99f3d91f8ce8ba13532c1e7be4ed1fac564bdf493119ea6f1
102 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to attract users searching for game cheats or free items. The document body, though heavily obfuscated, contains references to 'Free Roblox Catalog Clothes' and URLs related to game hacks, reinforcing the lure. The ML classifier and PDF link farm heuristics strongly indicate malicious intent, likely to redirect users to sites hosting malware or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/free-roblox-catalog-clothes-game-hack PDF link annotation
    • http://pia2000.net/images/pokemon-go-free-zip-code_GM1094591345.pdfIn PDF document text
    • http://pia2000.net/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/free-robux-generator-unblocked_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-face-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/roblox-premium-membership-hack_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6E 25968 bytes
SHA-256: 7e0d10e924595c383c419d5ed8f088377895b37253467971d74449c6052f9aee
font_01_sfnt_off00008a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A89 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off000097b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B0 18732 bytes
SHA-256: 4943ad1099620e9b609b459e7cd80eaf1481a4cc9dcf4121bf6c3b1492906bcd

Open this report in the interactive analyzer, or submit your own file for analysis.