Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34de27e1eb2f20f…

MALICIOUS

PDF

34.5 KB Created: 2021-07-09 11:04:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7faebafe5bf19bd6cde23e3bf83a508a SHA-1: 87a52b54ee5023951da290df54506b4bd63b3f0c SHA-256: e34de27e1eb2f20ff649b2a195906c31a2e25d2522eb68b8774e7cc136af452a
102 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are structured as SEO-optimized PDF slugs, suggesting a link farm. The document body and extracted URLs indicate a lure for game-related hacks and free in-game currency, likely to trick users into downloading malware. 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.tw/app/431946152/wahoogaming-co-free-robux-game-hack
    • http://cleansui.com.tw/image/data/files/hack-coin-master-without-root_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/coin-master-hack-apk-android-1_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/free-spin-coin-master-hack-2021_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/enter-this-secret-code-for-5m-free-robux_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/how-to-roblox-script-hack_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://cleansui.com.tw/image/data/files/hacks-roblox_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/roblox-rocitizens-money-hack-2021_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • http://cleansui.com.tw/image/data/files/holiday-crown-roblox-free_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/how-to-really-hack-coin-master_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/roblox-fly-hack-cheat-engine-64_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://cleansui.com.tw/image/data/files/jake-paul-merch-roblox-free_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://cleansui.com.tw/image/data/files/is-roblox-studio-free_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/minecraft-server-free-trial_GM479516143.pdf
    • https://cleansui.com.tw/image/data/files/free-roblox-templates_GM431946152.pdf
    • https://cleansui.com.tw/image/data/files/how-to-get-free-robux-in-roblox-pc-2021_GM431946152.pdf
    • http://cleansui.com.tw/image/data/files/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd0.bin
f79124abfa07c1f7e046367ef598afb80379e06e6cf0b50f281e9857f5bd2487
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD0 22020 bytes
font_01_sfnt_off000060cb.bin
74065a4619e2e03bb286e1d51fa8cb1024f73915723fc40e3305b74db5537c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CB 19460 bytes