Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d43e4e65cf392e…

MALICIOUS

PDF

34.4 KB Created: 2021-06-29 09:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6787c10a7ac5a1b110d0ba63fec4b95b SHA-1: e0d95525009aba738ec43159d3626e55079649d9 SHA-256: 52d43e4e65cf392e2bdd44cdc5d822e7fb97acf49bf797225b2e69d5c735edec
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files promising hacks or free items for popular games. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate malicious intent. The document likely serves as a lure to drive users to malicious sites or download further malware.

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/hack-denisdaily-on-roblox-game-hack
    • https://3qblocks.com.tw/image/data/files/how-to-hack-any-roblox-account_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/glitch-to-get-free-robux-no-apps_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/free-robux-discord_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/get-free-tiktok-likes_GM835599320.pdf
    • https://3qblocks.com.tw/image/data/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdf
    • https://3qblocks.com.tw/image/data/files/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • https://3qblocks.com.tw/image/data/files/lazy-blocks-com-free-robux_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/roblox-gift-card-redeem-free_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/jailbreak-beta-roblox-hack-dll_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdf
    • https://3qblocks.com.tw/image/data/files/robux-hack-generator_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/free-robux-instantly_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://3qblocks.com.tw/image/data/files/roblox-free-roblox_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/free-spins-on-coin-master-link_GM406889139.pdf
    • https://3qblocks.com.tw/image/data/files/free-daily-spin-coin-master-game_GM406889139.pdf
    • https://3qblocks.com.tw/image/data/files/how-to-coin-master-hack_GM406889139.pdf
    • https://3qblocks.com.tw/image/data/files/free-robux-without-doing-anything_GM431946152.pdf
    • https://3qblocks.com.tw/image/data/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f32.bin
a097c697a7f6ad76efe08db5d16b4ee2d73c7cdb824c023090af60ba8ce9c067
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F32 22160 bytes
font_01_sfnt_off00006058.bin
9c1373d3047323b01d7ed27494fb3a6da3aea916d242d4b50be89f5a213aca84
pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 19300 bytes