Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7d5c86b349a4d1…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 388d4c05a69ad71440b19af2d871b940 SHA-1: 9708bc3ce5dbc4e9059b7571c993680a0d499eaa SHA-256: 3f7d5c86b349a4d18ac9cd1384b3c25862f36dfc469b319bb65b14cc8e0a6c72
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to deceive the user into downloading a payload. The script then attempts to submit form data to the URL 'https://cardpayments.microransom.us/XZWtOUGVFcHJjbFZqWkRFclpsbzFXR2cyWVZKM1NraG5OR3h2Wm1oRVkyeG9iWGMzUTBOMU5Xc3dNbWg2SzFCbVdURTNaV1JGTUN0R01FUlRjRzlOWTNoaVFYUjZNRVZvU0ZKSVVVVm9NM0pVU1ROM01UZ3JURUpsVFZCaVpqTXJZMmRoUTBaa1owa3piVUU5TFMxNlJsUmlVM0ptWTNGbWRsbDFSSEF4YlRWVVMwSlJQVDA9LS1kNDBhNjU1MTcwZGU3NDhiOWQ1NTVhZGQ4MmQyODZlYTI1OTllZWEy?cid=901997550#FDF'. This behavior is consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9477

Heuristics 8

  • PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM
    PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
  • PDF JavaScript shows fake Acrobat updater prompt high PDF_FAKE_ACROBAT_UPDATE_LURE
    PDF JavaScript displays Acrobat/update-themed language such as a document rendering engine update or remote connection to Adobe servers. When paired with JavaScript or external submission, this is a social-engineering lure rather than benign document text.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://cardpayments.microransom.us/XZWtOUGVFcHJjbFZqWkRFclpsbzFXR2cyWVZKM1NraG5OR3h2Wm1oRVkyeG9iWGMzUTBOMU5Xc3dNbWg2SzFCbVdURTNaV1JGTUN0R01FUlRjRzlOWTNoaVFYUjZNRVZvU0ZKSVVVVm9NM0pVU1ROM01UZ3JURUpsVFZCaVpqTXJZMmRoUTBaa1owa3piVUU5TFMxNlJsUmlVM0ptWTNGbWRsbDFSSEF4YlRWVVMwSlJQVDA9LS1kNDBhNjU1MTcwZGU3NDhiOWQ1NTVhZGQ4MmQyODZlYTI1OTllZWEy?cid=901997550#FDF
    • https://cardpayments.microransom.us/XZVdkQ1MwOVBabkU0VDIxQ1N5dDZhWGhOVmtsUldXaFNXRXQ2THpKUE9XdGFWVXg1ZVdkNVJWWmhMM05zY3psaVZYWjFhRTUzTkdoWmJVMHpOM1JoTWtFMVYxUk5aazV0ZWxobFJubEVPWEZzUW1GNFpGaHdUMUZFVWpZME9WQnVaVzF2VjJ0WFpqaHBNRWh1UmsxTVpWVkNNVGxWWWpsa09GcE5OSGxxUlRsSFNrbEpUVXg0UlhCM1Z6UkhRbEJqZEVKck5ubDNOVFZ5UVV0NFV5dEhZVTlGWVZsNk4wTm9VVEZuUFMwdGMxWmtSRWQzYUV0NGNFSjNiV1YzUkZsYWFWTnFaejA5LS01MjM5ODgyMWM4ZjJlMzcyMWQ3Y2Q5NzA2NjQ2YjQ1ODExOTlmZjM1?cid=901997550
    • https://cardpayments.microransom.us/XV1VSeVlWQjJNa3RYUWpaeFluQmxSalJtVG5aNGRHNHljR2gzWkZoaFRHTmpXbVYwVGt0SlQzTnlaamROVUZWblozQlhSREE0ZUZOWU9IZG1URWhwUkRONlNXMXRhbXd4YzJ0aWIyeDNSSGxGV2xCU2VIaEpTemd2WW1ocWQwczBjV1lyWkdabGJUaGlTRlUxVkdKblVUVmlRVk54WW5FelFVZGpjRTluVXpZeFdtWnJSM0paUm04MmMzazNiblowUWxSbVpXSlNPVmxYUzJkSEt6SXlkMkZEYTBWM1VqUndPV0pCUFMwdFFYcFBhSE5SVlZwRE1ucFdTMDlRVDFWcVNuZFFkejA5LS0wZWU0YTMwYTJiODEyODMxZDdiNGY0OGUyNjg3MmQ5YmM1MjI1MmVk?cid=901997550
    • https://cardpayments.microransom.us/XZFhGSGFsbE5VV1JZZVdnNVEwbDBhV3RtYkVwbkx6bDNXRmxyZFVWQ1VWSnlNVUZPV1d4Q09YTkZMMmhVUW5kcE4xZE9jVlp0VmpZM1ZERklOMjl6Tlhvd2J5dDVVREZVVXk5eVMzTTNRVGN5VmpkWFdXczNSV2tyV1RkbFZHUklMMkptUkZVeVNYWndVMkZYVG5kbWRTOTFhMWQxTTNWcVpWTnhUSEJpUlVSQk4xZ3dhRmxzTUVsQmNHVmhabk0xU1UweFpUUTJRbWRqWWtKM1YzTkdkbVFyYW5nNVpEbFZPRGRGUFMwdFRGTmtTVkpvUVZjclZucDRWVzVKWkRKYWVFeEhkejA5LS1mMjQxYzAwZGQzNDJmNWY0ZDczZmQ0ZjM3NzVjNWNmNzcxNzQ1OGY1?cid=901997550
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
b90d1bfad6b0ebaf29b7685c381243d46a0d8ada85fcb62ccae06f028e50a70e		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 605 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
a0c3a107b6a199afa06389730e36146c732b501e144dcd7d718c3dd983854df4		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103742 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019663.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19663 4575 bytes

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