Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0456dfa9dc0b9b…

MALICIOUS

PDF

43.9 KB Created: 2021-05-11 23:34:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 807f60e1ed481f884ae7402431f3560c SHA-1: eefcdbc8299f2cda33ec830baa65135eaa70fa04 SHA-256: ca0456dfa9dc0b9badce6ee784c202591a4b21c59569ddfd2b94ec74c0618204
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to websites that appear to be part of a link farm or scam operation. The document body, though heavily obfuscated, contains references to hacking Roblox accounts and includes URLs that likely lead to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

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-hack-peoples-roblox-accounts-game-hack
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/how-do-u-get-robux_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/coin-master-heaven-links-free-spins_GM406889139.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/teach-me-to-hack_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-free-robux-generator_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/how-to-get-free-roblox-premium_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/se-puede-hackear-coin-master_GM406889139.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-hack-codes_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/optifine-minecraft-pe_GM479516143.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-ftw_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/roblox-heroes-online_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/robux-hack-generator_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/rbl-gg-free-robux_GM431946152.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/free-spins-on-coin-master-iphone_GM406889139.pdf
    • https://www.waymedicalsupplies.com/uploaded_files/userfiles/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e2d.bin
5dff4218d3495d8973656fb8bdd4dd5dd0492083bead751725d8a4d863250c6e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E2D 25000 bytes
font_01_sfnt_off0000871f.bin
cd7407ef9aef6c4c50b1fdf01e763fd2e22944ade267215dee183f168e7b87f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871F 18920 bytes

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