Malicious PDF — malware analysis report

Static analysis result for SHA-256 e726a81eccbeaf4b…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 05:00:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb7abe11b8cc0b1c052129c147044b1d SHA-1: f97bf12c482fb895657c8e87f8ed876e3218e799 SHA-256: e726a81eccbeaf4b0903e78fa144099df5d23aaff32cd22f017f6c70e0f71f71
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages related to game hacks and free spins. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly suggests maliciousness. The document body, though partially corrupted, contains a URL related to 'free faces on Roblox', aligning with the link farm's theme. This suggests the PDF is designed to drive traffic to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-to-get-free-faces-on-roblox-game-hack
    • https://ciudadata.ec/images/ckfinder/files/coin-master-daily-free-spins-hack_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-spin-link-in-coin-master_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-to-download-wurst_GM479516143.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-free-link_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-hack-cydia_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/20-free-spin-link-coin-master_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-can-you-get-free-robux_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-minecraft-wallpaper_GM479516143.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/earn-free-spins-coin-master_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-collect-today-free-spin_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/minecraft-education-free_GM479516143.pdf
    • https://ciudadata.ec/images/ckfinder/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/coin-master-free-soins_GM406889139.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • https://ciudadata.ec/images/ckfinder/files/free-hacks-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b1a.bin
245d15e4c1f682616a48162a86f64e5738ee79998c199898555aa6e6ef5eab3c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1A 26572 bytes
font_01_sfnt_off000087f1.bin
6f560aa272d9aedbef1805ae90d6020cfb19865522838e20e165899e8cb1ee62
pdf-font-stream PDF embedded font (sfnt) at offset 0x87F1 18444 bytes