Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c1ef062f6e619a…

MALICIOUS

PDF

35.2 KB Created: 2021-06-19 02:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8ba19469482c4f007920a596f90297d6 SHA-1: b40307f1bf1b8dd3c5bb0e34c0e18e8111509707 SHA-256: 51c1ef062f6e619a15fc64b0a9082563cd4e4fa21b35e49e7cda6a73353f0556
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains numerous embedded links to external websites, many of which are SEO-optimized PDFs related to game hacks and cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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/how-to-get-free-robux-on-roblox-2021-youtube-game-hack
    • https://foc.vn/public/upload/files/coin-master-hacks-no-surveys_GM406889139.pdf
    • https://foc.vn/public/upload/files/play-minecraft-free-online-no-download_GM479516143.pdf
    • https://foc.vn/public/upload/files/robux-hack-no-human-verification_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-robux-hack-2021_GM431946152.pdf
    • https://foc.vn/public/upload/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • https://foc.vn/public/upload/files/how-can-i-get-free-robux_GM431946152.pdf
    • https://foc.vn/public/upload/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • https://foc.vn/public/upload/files/roblox-place-rewards_GM431946152.pdf
    • https://foc.vn/public/upload/files/coin-master-free-spins-and-coins-group_GM406889139.pdf
    • https://foc.vn/public/upload/files/https-pastebin-com-free-robux_GM431946152.pdf
    • https://foc.vn/public/upload/files/get-free-robux-now_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-minecraft-maps_GM479516143.pdf
    • https://foc.vn/public/upload/files/roblox-cp_GM431946152.pdf
    • https://foc.vn/public/upload/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://foc.vn/public/upload/files/hack-de-cuentas-de-roblox_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-online-minecraft-server_GM479516143.pdf
    • https://foc.vn/public/upload/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • https://foc.vn/public/upload/files/best-free-minecraft-server-hosting_GM479516143.pdf
    • https://foc.vn/public/upload/files/admin-hacks-roblox-ban-pll_GM431946152.pdf
    • https://foc.vn/public/upload/files/bloxpink-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000313b.bin
fb2b881f11c158b2135aeb4f7ef9fbeec01d375095c43afb8be51c30d092f5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x313B 22388 bytes
font_01_sfnt_off000062e0.bin
a6f6cf867a4b6e77496a9e7474d02ed78ffaf2459d7a78ee0da8313aa76ea876
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E0 19620 bytes