Malicious PDF — malware analysis report

Static analysis result for SHA-256 158c68ce56624ccb…

MALICIOUS

PDF

36.7 KB Created: 2021-05-23 18:50:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bef4d22a4eb2203ab5924cc0c7b321e1 SHA-1: 8d4d9b7a22c1b1764e076cea1b9c48a9e5f4d011 SHA-256: 158c68ce56624ccb4b9bf02a23c505bacfdc8840ceaccf1bd90a4d8cf1b271e2
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, a common social engineering tactic to trick users into interacting with malicious content. It also embeds external URIs pointing to potentially malicious download sites, suggesting it's designed to deliver a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/how-to-get-free-robux-on-computer-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34C2 25028 bytes
SHA-256: 0e665d8c67a408b84629635de0f8a31abd9edc9f4ffecb27746abc86f1a5ac59
font_01_sfnt_off00006ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCC 18716 bytes
SHA-256: 2c87d7c74b7bcd7fade186f781764640e14dfaf637cd5e280742c056ede93ace

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