Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5dfe434961d02c…

MALICIOUS

PDF

33.4 KB Created: 2021-06-20 12:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 70165924aed6e2ea99a1a89a5ae597a5 SHA-1: b8757b3a890fe9646e1da4cddfd5bd5930c9ac15 SHA-256: cd5dfe434961d02c4bf623502fb7610b8b1cd3f8ec878289335f22dbd565a9ed
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, that point to sites offering cheats for games like Roblox and Coin Master. The document body explicitly mentions 'Can You Sell Shirts For Free In Roblox' and includes a call-to-action to 'CLICK HERE TO ACCESS ROBUX G', indicating a lure for users seeking in-game advantages. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/can-you-sell-shirts-for-free-in-roblox-game-hack
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-link-may-2021_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/roblox-free-clothes-no-bc_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/hack-coin-master-pc_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/get-free-spins-coin-master-2021_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/master-coin-master-free-spin_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/coin-master-332-apk-free-download_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/roblox-hacked-com-2021_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/free-roblox-shirt-templates_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/coin-master-15-free-spin-link-today_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/coin-master-hack-spins-ios_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/jailbreak-script_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/free-robux-auto-redeem_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/coin-master-hack-2021-apk_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/free-spin-link-coin-master-today_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/coin-master-hack-tool-access-online-generator_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/free-robux-only-username_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b95.bin
87bff6aded95f1357414eb061b31827053f10dd928b7b8ac09b0b71e5dfcad96
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B95 22332 bytes
font_01_sfnt_off00005d28.bin
f04cb8d3917484e174e7bf6e77a2cf5f000b1e4e7a60407a0d7be297aeb3dd24
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D28 19340 bytes