Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcdb8cddb209bf3…

MALICIOUS

PDF

46.4 KB Created: 2021-05-15 14:32:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ab164713394e9d34efa17e0838b80ccc SHA-1: 7fee44b2f8f18e3dda69ab5b1c764f5b3e148147 SHA-256: 5bcdb8cddb209bf3de3d4f45cae0040894e079632e4ad06147eae7c36b65e657
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many of which appear to be related to game cheats or rewards. The primary URL, https://netcdn.xyz/app/431946152/free-ways-to-get-robux-game-hack, suggests a scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • 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/free-ways-to-get-robux-game-hack
    • http://finalstand.org/images/coin-master-rewards-app_GM406889139.pdf
    • http://finalstand.org/images/free-spins-coin-master-links_GM406889139.pdf
    • http://finalstand.org/images/free-robux-no-apps_GM431946152.pdf
    • http://finalstand.org/images/free-robux-2021_GM431946152.pdf
    • http://finalstand.org/images/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • http://finalstand.org/images/free-roblox-accounts-that-work_GM431946152.pdf
    • http://finalstand.org/images/coin-master-free-snacks-link_GM406889139.pdf
    • http://finalstand.org/images/coin-master-hack-https-coinms-net_GM406889139.pdf
    • http://finalstand.org/images/earn-rbx_GM431946152.pdf
    • http://finalstand.org/images/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://finalstand.org/images/free-coin-master-spin-app_GM406889139.pdf
    • http://finalstand.org/images/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://finalstand.org/images/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://finalstand.org/images/minecraft-pc-download-free-full-version_GM479516143.pdf
    • http://finalstand.org/images/minecraft-116-apk-download_GM479516143.pdf
    • http://finalstand.org/images/coin-master-hack-spins-android_GM406889139.pdf
    • http://finalstand.org/images/free-robux-promo-codes_GM431946152.pdf
    • http://finalstand.org/images/app-store-coin-master-free-spins_GM406889139.pdf
    • http://finalstand.org/images/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://finalstand.org/images/coin-master-gift-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a84.bin
25dd7f8ef87c179227c50e4425caffcfd5eeed9026c8504877e1c3c5107c8b6f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A84 26644 bytes
font_01_sfnt_off0000879e.bin
baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x879E 2844 bytes
font_02_sfnt_off00009160.bin
4748f019d46a9554f00c7c8cf9bb59ec204dfb95bc520e2d25b5a7c8ef81b270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9160 18724 bytes

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