Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b71cd7392d3d8fa…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 17:30:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 94dd75fb715049d48ca5ccd5091b2c7b SHA-1: a02a524b24c1f8f6bb6ca13fc2f46794132c9292 SHA-256: 7b71cd7392d3d8fa34249ed3eaaa722383d028b37e4f4147293520d445ce5046
82 Risk Score

Malware Insights

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

The sample was identified as malicious by an ML classifier and exhibits characteristics of a social engineering attack. It presents a fake CAPTCHA to trick users into downloading content, likely a second-stage payload, from external URLs. The embedded URLs point to various game-related lures, suggesting a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-tycoons-free-game-hack
    • http://centr-expert.su/images/chisel-and-bits-mod-minecraft-pe_GM479516143.pdf
    • http://centr-expert.su/images/rbx-hut_GM431946152.pdf
    • http://centr-expert.su/images/minecraft-java-edition-free-trial_GM479516143.pdf
    • http://centr-expert.su/images/roblox36com-free-robux_GM431946152.pdf
    • http://centr-expert.su/images/coin-master-free-spins-app_GM406889139.pdf
    • http://centr-expert.su/images/coin-master-hack-activegamer_GM406889139.pdf
    • http://centr-expert.su/images/free-minecraft-client_GM479516143.pdf
    • http://centr-expert.su/images/minecraft-free-play-no-download_GM479516143.pdf
    • http://centr-expert.su/images/robux-generator-that-works_GM431946152.pdf
    • http://centr-expert.su/images/how-to-hack-back-a-roblox-accunt_GM431946152.pdf
    • http://centr-expert.su/images/free-coin-master-stuff_GM406889139.pdf
    • http://centr-expert.su/images/tiktok-free-play_GM835599320.pdf
    • http://centr-expert.su/images/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://centr-expert.su/images/coin-master-hack-download-ios_GM406889139.pdf
    • http://centr-expert.su/images/minecraft-free-download_GM479516143.pdf
    • http://centr-expert.su/images/roblox-free-clothes-girl_GM431946152.pdf
    • http://centr-expert.su/images/free-robux-cheats-without-human-verification_GM431946152.pdf
    • http://centr-expert.su/images/how-to-hack-roblox-cash_GM431946152.pdf
    • http://centr-expert.su/images/adopt-me-roblox-hacks_GM431946152.pdf
    • http://centr-expert.su/images/robux-cheat_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d91.bin
cae2a800a4385f7b4f6522a03b77a913e019d2516c0887f88246e15023e30cf5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D91 26260 bytes
font_01_sfnt_off00008b37.bin
591ab88e737d0e640c1c2eeb0025de7baff5823816b84e0bf4b3099f77eed0f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B37 18128 bytes

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