Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf29ec1e8af5c50…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 06:34:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5bd2db35ffa4a734cbee94e0f7fcc04c SHA-1: 8f9832b999ee66a7d81c45888f860107c71b29e4 SHA-256: bbf29ec1e8af5c50d706c91da093ae2f5cf01b8bb0fd07a9504a189d9e666657
162 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a download button lure, aiming to trick the user into clicking embedded links. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one prominent URL pointing to a 'free robux script'. This suggests a social engineering tactic to deliver a payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-robux-script-2021-game-hack
    • http://www.e-lysis.com/images/coin-master-redeem-code-free_GM406889139.pdf
    • http://www.e-lysis.com/images/add-robux_GM431946152.pdf
    • http://www.e-lysis.com/images/earn-free-robux-on-roblox_GM431946152.pdf
    • http://www.e-lysis.com/images/how-to-install-minecraft-for-free_GM479516143.pdf
    • http://www.e-lysis.com/images/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdf
    • http://www.e-lysis.com/images/no-human-verification-coin-master-hack_GM406889139.pdf
    • http://www.e-lysis.com/images/www-free-robux-com_GM431946152.pdf
    • http://www.e-lysis.com/images/como-hackear-coin-master-espaol_GM406889139.pdf
    • http://www.e-lysis.com/images/free-coins-app-for-coin-master_GM406889139.pdf
    • http://www.e-lysis.com/images/minecraft-diamond-finder-hack_GM479516143.pdf
    • http://www.e-lysis.com/images/roblox-fly-hack-2021-download_GM431946152.pdf
    • http://www.e-lysis.com/images/coin-master-free-spin-app-apk_GM406889139.pdf
    • http://www.e-lysis.com/images/get-coin-master-cards-free_GM406889139.pdf
    • http://www.e-lysis.com/images/free-spins-from-coin-master_GM406889139.pdf
    • http://www.e-lysis.com/images/roblox-old-version-free-download_GM431946152.pdf
    • http://www.e-lysis.com/images/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdf
    • http://www.e-lysis.com/images/coin-master-free-spins-daily_GM406889139.pdf
    • http://www.e-lysis.com/images/free-tiktok-followers-without-verification_GM835599320.pdf
    • http://www.e-lysis.com/images/free-2021-roblox-accounts_GM431946152.pdf
    • http://www.e-lysis.com/images/how-to-get-free-robux-using-your-phone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005128.bin
93fd0dcdc54fe6d6a5337731528bcb227c3d9df1bcd01918c1e512ad74f283d3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5128 27424 bytes
font_01_sfnt_off00009064.bin
618faae8a74a198a7d802438d34489e5ce0f2a38dedb8431505b1a75f3bd260e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9064 18816 bytes

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