Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd65cb16d249539…

MALICIOUS

PDF

46.9 KB Created: 2021-05-15 15:05:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3d31604cf726997a94de42f5acd10999 SHA-1: e1a00e0a70d9ebcbf80670885752af05901ed3e1 SHA-256: bdd65cb16d24953936d6fe35068aa843b01e7bcfda039c8c79e240159bd9a9ff
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm, with many pointing to files related to game hacks and cheats. One prominent URL, https://netcdn.xyz/app/431946152/roblox-hack-2021-game-hack, is directly embedded. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a coordinated effort to direct users to potentially malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/roblox-hack-2021-game-hack
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-coin-master-spins-hack_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/bux-life-free-robux_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-gift-card-generator_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/roblox-pink-free-robux_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/robux-for-surveys_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-without-any-verification_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/coin-master-fan-page_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004f00.bin
cf872965e21116e2f47e9289d46f2db4ed8521c8ab7838bff0c0ca134f6e36ec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F00 24860 bytes
font_01_sfnt_off00008720.bin
40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8720 3884 bytes
font_02_sfnt_off000093c8.bin
2941163c9806e22b58ea5552aa71059231a9f2c3bbffbca0ecd460ca17501cff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C8 18584 bytes

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