Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee35a3c20f470cc3…

MALICIOUS

PDF

49.2 KB Created: 2021-05-12 13:03:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e2ccc75aed934edbb29780b6c747879 SHA-1: 25fd3c90bbb708d30d111455f1ebec862151c7d2 SHA-256: ee35a3c20f470cc32e7f887105ff3daf5eb06626f999fd571b1665b7264fff46
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into interacting with malicious content. It contains an embedded URI pointing to a URL associated with 'free robux' and game hacks, suggesting a lure for potentially unwanted software or malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/get-free-robux-info-game-hack
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/static-moonactive-net-rewards-2021_GM406889139.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/coin-master-hack-download-ios_GM406889139.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/games-in-roblox-that-give-you-robux_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/coin-master-hack-apk_GM406889139.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/roblox-fun-com-free-robux_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/roblox-printables-free_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/coin-master-free-spins-cheats_GM406889139.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/roblox-free-robux-com_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/free-robux-instantly_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/free-minecraft-alts_GM479516143.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/rewards-roblox_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification-2021_GM431946152.pdf
    • https://elearning.mts-sukaramaiatas.sch.id/__statics/gudangsoal/files/rbx-hut_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d01.bin
358e426b6cf3730bc75d3d45df4ddac9d3591f52a6d2569a00cbaea005cf5b53		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D01 36812 bytes
font_01_sfnt_off00009f04.bin
6e6e8bb7c0e640fc67837f70826b1bbd381eb05acf75ec047415621944091573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F04 18120 bytes

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