Malicious PDF — malware analysis report

Static analysis result for SHA-256 041999cfb791e2a1…

MALICIOUS

PDF

44.0 KB Created: 2021-05-15 11:06:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2d3e1bf9776a73996987ed3eb01990fe SHA-1: 256452893496ba1a0d84c667ec234220c22545ed SHA-256: 041999cfb791e2a177836bf9a38d7bf5150da06e07cd07e2e328c93a7ef863b2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as 'link farms' for SEO purposes, suggesting a deceptive intent. The document body and extracted URLs indicate a lure for free in-game items, likely a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of malicious intent, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/instagram-coin-master-free-spins-game-hack
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/no-scam-free-robux_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-pet-food-coin-master_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/unlimited-coin-master-free-spins_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/roblox-skin-free_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/rbx-robux_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-app_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-real-free-spins_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-spin-coin-master-link-download_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/how-do-you-get-roebucks_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/minecraft-for-free-apk_GM479516143.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-spin-free_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/free-robux-no-verification_GM431946152.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/can-you-really-hack-coin-master-ios_GM406889139.pdf
    • https://www.salcsinstallations.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdf
    • https://coinmasterspinandcoin.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a1a.bin
619b7679419bb4ccfc315a389a8723f1f19f1e0130a20d8aa69360a2e4fda79c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1A 23508 bytes
font_01_sfnt_off00007f28.bin
381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F28 2824 bytes
font_02_sfnt_off000088cb.bin
2b49b18ea8e6af85f9d01b8086051709ac83a6aa6280f9f1047115a4054a4512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CB 18432 bytes

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