Malicious PDF — malware analysis report

Static analysis result for SHA-256 eefb3c8e5768db85…

MALICIOUS

PDF

42.9 KB Created: 2021-05-14 10:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dde3882fe3fcc7438bd03ada87570268 SHA-1: 16f379db323648206fbf2154590f1244a5db21ff SHA-256: eefb3c8e5768db85170ee3a21d4ac1d346b54fca3eb981aeab2d2ae0ad82f2ad
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, encouraging users to click on links that lead to external websites. One of these links, https://netcdn.xyz/app/431946152/free-roblox-website-game-hack, is directly embedded and flagged as a malicious URI. The document's structure and embedded links suggest it is designed to trick users into downloading further malicious content, likely through a drive-by download or by exploiting a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9037

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/free-roblox-website-game-hack PDF link annotation
    • http://aljazeera-me.com/images/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://aljazeera-me.com/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://aljazeera-me.com/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://aljazeera-me.com/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://aljazeera-me.com/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://aljazeera-me.com/images/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://aljazeera-me.com/images/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003b85.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3B85 28076 bytes
SHA-256: cbad63bcff39bd34021515a85f6bc5b2bd3c1fce60980234f45902ff785d827f
font_01_sfnt_off00007bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBD 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off00008562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8562 18372 bytes
SHA-256: 4f49704c3d2016fd3d486e698c5af7a9a5561cf776b84bb9dfcb3ffa887994c7

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