Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa4fefa658e8bef…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 21:31:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2b9ac4f9275c215119ff850bf474f1f3 SHA-1: a9c404338acb0fd2e5a07ad686508928f4ac4684 SHA-256: caa4fefa658e8befccc2cc0160ed6745ecf88451568d90f6466c400ee0ecc51e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly offers 'Free Robux', indicating a lure for potentially malicious downloads or scams. The PDF_SEO_LINK_FARM heuristic suggests a large number of external links, likely for SEO manipulation or to host further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure strongly suggest an attempt to redirect users to malicious sites, possibly involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.xyz/app/431946152/get-me-free-robux-game-hack
    • http://floreswindows.com/images/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • http://floreswindows.com/images/how-to-use-wurst_GM479516143.pdf
    • http://floreswindows.com/images/easy-robux-today_GM431946152.pdf
    • http://floreswindows.com/images/gameoffice-net-hack-coin-master_GM406889139.pdf
    • http://floreswindows.com/images/how-to-get-free-robux-without-email_GM431946152.pdf
    • http://floreswindows.com/images/how-to-hack-coin-master-spin_GM406889139.pdf
    • http://floreswindows.com/images/free-robux-no-human-verification-and-no-survey_GM431946152.pdf
    • http://floreswindows.com/images/coin-master-2021-free-spins-link-2021_GM406889139.pdf
    • http://floreswindows.com/images/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • http://floreswindows.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://floreswindows.com/images/grab-points-login_GM431946152.pdf
    • http://floreswindows.com/images/minecraft-free-download-windows_GM479516143.pdf
    • http://floreswindows.com/images/village-4-coin-master_GM406889139.pdf
    • http://floreswindows.com/images/free-coin-master-hacks_GM406889139.pdf
    • http://floreswindows.com/images/coin-master-free-spins-23-march-2021_GM406889139.pdf
    • http://floreswindows.com/images/free-coins-2021-coin-master-link_GM406889139.pdf
    • http://floreswindows.com/images/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://floreswindows.com/images/hack-client_GM479516143.pdf
    • http://floreswindows.com/images/free-robux-thumbnail_GM431946152.pdf
    • http://floreswindows.com/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bc9.bin
e66e5237e8ebf14c1ef5f7517026deea6a581857488a5643943aeb82e6c26907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC9 24516 bytes
font_01_sfnt_off000083ec.bin
e3f176f8735a7a9c211288ec5f3dfc0a25536bb398bd4870e4b297ba4f960079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EC 18312 bytes

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