Malicious PDF — malware analysis report

Static analysis result for SHA-256 18668a38d8dd2510…

MALICIOUS

PDF

35.3 KB Created: 2021-07-07 11:34:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8d0961bf827404d9a91cf8000c06019a SHA-1: a9f9ade6707d1f6458a52dfc5d536729180c3f00 SHA-256: 18668a38d8dd2510631a39f68bbf1220f3b414346582a552eacd9b3d4b528a05
102 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 of which are structured as SEO-optimized links to other PDF files, suggesting a link farm or content-spinning operation. The document body and extracted URLs indicate a lure for game-related hacks and free items, likely to trick users into downloading malware. The ML classifier 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.tw/app/406889139/coin-master-free-spin-app-reviews-game-hack
    • http://www.jsvillas.com.tw/assets/files/roblox-free-robot-animation-pack_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-rape-hack_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/how-do-u-get-free-robux-for-roblox_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-zombie-rush-free-online_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/apps-that-give-you-free-robux_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-character-free_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/paste-bin-robux-hack_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/free-mods-for-coin-master_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-spin-free_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/minecraft-roblox-hack_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/free-tiktok-accounts-with-followers_GM835599320.pdf
    • http://www.jsvillas.com.tw/assets/files/4live-fun-free-robux_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/roblox-robux-game-hack-com_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://www.jsvillas.com.tw/assets/files/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • http://www.jsvillas.com.tw/assets/files/free-robux-generator-without-survey_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/proof-how-to-steal-hack-accountson-roblox-get-free-robux_GM431946152.pdf
    • http://www.jsvillas.com.tw/assets/files/real-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000032d3.bin
2e531d95e47c3dc66ba7e835703c942a246e8131d34e84c0e4bbf2747d805b9b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D3 23028 bytes
font_01_sfnt_off00006692.bin
4fb3e6b180a488a45a4a6afa62ffd7475f97d3e37eaae5eab2fa9c720cb5f821
pdf-font-stream PDF embedded font (sfnt) at offset 0x6692 18452 bytes