Malicious PDF — malware analysis report

Static analysis result for SHA-256 808da48f38554404…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 09:49:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 313758f989667b521471d0dd2b4abb5c SHA-1: 6c085df0de0868b609c434b5e01fd9d820b613ad SHA-256: 808da48f3855440477cada38ee6afe563c84ca8102de683143af42607d44e4f8
122 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to IP addresses, which is indicative of a link farm designed to host malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body and extracted URLs suggest a lure for game cheats and hacks, likely leading to malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/431946152/dailyrobux-game-hack
    • http://217.165.206.12/userfiles/files/coin-master-online-hack-tool_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/noob-invasion-roblox-get-free-kills_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/ccv5-roblox-dbfp-hack-tuto-2021_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/rbl-gg-free-robux_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/roblox-premium-free_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/free-tiktok-followers-in-5-minutes_GM835599320.pdf
    • http://217.165.206.12/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/free-minecraft-website_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/roblox-piano-hack-sheets_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/coin-master-free-in-app-purchases_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/teach-me-to-hack_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/minecraft-pe-free-download-android_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/free-cracked-minecraft-server-hosting_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/free-robux-no-scam_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/how-to-get-free-robux-2021-unpatched_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eeb.bin
3f305ac8cae403873062c9c1cb58ffbc40a6002cceb9ed04316f15a60e61cc7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EEB 23268 bytes
font_01_sfnt_off000062bc.bin
319a3b741e60406540a19adb70d742732d8bf817a9bc58f36e4d58ba7e1a6a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x62BC 19092 bytes