Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d83c5d993f6922…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 03:22:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 26b9a1a1f10136bc918f97025d1a1d49 SHA-1: 4422559c5188dafcf8535c5f6541751f978cce84 SHA-256: 70d83c5d993f6922e79f1e2e2b2fc1584a8e56d9967da92c2d4f5246667ac068
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to other PDFs, forming a link farm designed to attract users searching for game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/free-robux-no-human-verification-2021-or-survey-game-hack, likely serves as a lure to download a secondary payload. The ML classifier strongly indicated maliciousness, and the presence of external links and a call-to-action button further supports this assessment.

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-no-human-verification-2021-or-survey-game-hack
    • https://www.wannon.tw/upload/files/how-to-hack-roblox-without-downloading-any-apps_GM431946152.pdf
    • https://www.wannon.tw/upload/files/coin-master-free-spin-today_GM406889139.pdf
    • https://www.wannon.tw/upload/files/youtube-hack-any-roblox-account-no-loading_GM431946152.pdf
    • https://www.wannon.tw/upload/files/static-moonactive-net-link_GM406889139.pdf
    • https://www.wannon.tw/upload/files/coin-master-free-cards-and-spin-link_GM406889139.pdf
    • https://www.wannon.tw/upload/files/what-is-coin-master-app_GM406889139.pdf
    • https://www.wannon.tw/upload/files/free-spin-link-coin-master-app_GM406889139.pdf
    • https://www.wannon.tw/upload/files/free-sjywars-servers-for-roblox_GM431946152.pdf
    • https://www.wannon.tw/upload/files/how-to-hack-other-players-in-roblox_GM431946152.pdf
    • https://www.wannon.tw/upload/files/btools-hack-for-roblox-link_GM431946152.pdf
    • https://www.wannon.tw/upload/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdf
    • https://www.wannon.tw/upload/files/free-minecraft-coloring-pages_GM479516143.pdf
    • https://www.wannon.tw/upload/files/01-know-this-free-robux-secret_GM431946152.pdf
    • https://www.wannon.tw/upload/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://www.wannon.tw/upload/files/free-roblox-gear-2021_GM431946152.pdf
    • https://www.wannon.tw/upload/files/free-robux-kid-friendly_GM431946152.pdf
    • https://www.wannon.tw/upload/files/free-robux-com-2021_GM431946152.pdf
    • https://www.wannon.tw/upload/files/coin-master-free-gift-link-2021_GM406889139.pdf
    • https://www.wannon.tw/upload/files/roblox-hack-game_GM431946152.pdf
    • https://www.wannon.tw/upload/files/pubg-uc-carding-method-2021_GM1330123889.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302d.bin
f5a792544586a3cb0bec11e1878eb588697c1b3908154f9737ca58787ee46f76
pdf-font-stream PDF embedded font (sfnt) at offset 0x302D 22160 bytes
font_01_sfnt_off00006123.bin
0f6b43ae9e65d7a80009945f739e437c192855e977f33187dcbeb8854b1faeec
pdf-font-stream PDF embedded font (sfnt) at offset 0x6123 20028 bytes