Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d514048bbae0a98…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 20:52:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2f81d9e9a4e880b68606f75bf10122aa SHA-1: ed1c559d55566ed074ac642c57c04055f9cfc28e SHA-256: 6d514048bbae0a98b356df6bad9e7d735f3c0c598d3f6c1bf67e16de04230406
102 Risk Score

Malware Insights

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

This PDF document is designed as a lure, using the guise of providing free in-game currency for popular games like Coin Master and Roblox. It contains a large number of external links, many pointing to other PDF files, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/how-to-get-free-spins-in-coin-master-game-hack
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/coin-master-free-spins-link_GM406889139.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/free-minecraft-pe-server_GM479516143.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/free-roblox-girl-hair-not-a-model_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/make-free-robux_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/collect-robux_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/coin-master-hack-free-spins_GM406889139.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/how-to-get-robux-without-paying_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/minecraft-bedrock-free-server-hosting_GM479516143.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/coin-master-heaven-links_GM406889139.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/roblox-april-fools-hack_GM431946152.pdf
    • https://jasapembersihtoilet.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a1d.bin
011ad53657ffeb9a2701d0ee981310be4a0f7536d3d23d16d050094e25ff363f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1D 25548 bytes
font_01_sfnt_off000084c5.bin
52b27d49d658c5dd219fe1685a79a71966a386845fdc62a41335e5719e4d5001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C5 18052 bytes

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