Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a54bd69e3cbaa3…

MALICIOUS

PDF

107.5 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 675b81f0cef35562c31239595e07c802 SHA-1: 9ae807727c213514e931bd63bb862e13306e52ef SHA-256: 92a54bd69e3cbaa3939a7e901cc0f729a0a33a218f01c6f0a84b2826451c4761
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, a common social engineering lure. This script also attempts to submit form data to the URL 'https://cardpayments.microransom.us/XVVdSc05FazVXRmxDWm1sWWFrWkhXaTk0WjNGQ09XbEJaRkZ3WTJaWllVbzFOMHBuZFc1d1JucENUMGswY1VSRFJYY3hTVUl3T0hWRU1VeFRMekZEVkhOWmRqVnZiQ3R4UmtSQ1RHNXdTMUV6TkVSVlFqVmpXbFp0TVdSc2JUTjZaa1Y2ZWpaUGNEaDRlVzg5TFMxbU9WRlBlRkFyTjJoWE9VVnNaV0YwUkZWcVNtWkJQVDA9LS1jZDk2ZjY2NTRjODM0ZmQ4YjQwNmQyZDgxODlkOTNlNmUxODNiNDM4?cid=907959799#FDF'. This action is indicative of an attempt to download and execute a second-stage payload, aligning with typical malicious PDF behavior.

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/XVVdSc05FazVXRmxDWm1sWWFrWkhXaTk0WjNGQ09XbEJaRkZ3WTJaWllVbzFOMHBuZFc1d1JucENUMGswY1VSRFJYY3hTVUl3T0hWRU1VeFRMekZEVkhOWmRqVnZiQ3R4UmtSQ1RHNXdTMUV6TkVSVlFqVmpXbFp0TVdSc2JUTjZaa1Y2ZWpaUGNEaDRlVzg5TFMxbU9WRlBlRkFyTjJoWE9VVnNaV0YwUkZWcVNtWkJQVDA9LS1jZDk2ZjY2NTRjODM0ZmQ4YjQwNmQyZDgxODlkOTNlNmUxODNiNDM4?cid=907959799#FDF
    • https://cardpayments.microransom.us/XSzFsNFpuZzJTblZQWTJOdGRqTkRNMlp2ZDJaMlIySTBSMEppUlZoQ1pYZEtZVnBJY0ZONlVHdEpkbEo1YUZGNFZucHdibTVHY2paSmNVZGtPRVJNY0cxdlMxaHBiVkpKVld3emFWQlJNamhhTWt0SmNDdFhOMnhYYUdwSFlYQm9OSFpCWkdoMGNXaFhSVGsyVEZoSmExSTVVa2MzYjNsclEwVTRPSE5ZWld0TWQxZFNWbXhWWTJJNU0wTjFlRUZPUjBkME5VazJhR2RsVVU5NmIwZEthRmcxVVVoaGQxazRRMjlLWkdWWk1VOXRNR3B0U1RZMFdISkJOMlIxYkdjd0xTMW9MMHBFZVhkNk0wNTBXSFkyV1UxNllsZHRiM2QzUFQwPS0tZDdkNGQ2MzY5OGZlMDQzN2IwNzcxYzA4ZWFmNjMxMDEwOTcxODlmNg==?cid=907959799
    • https://cardpayments.microransom.us/XV0doRGNWWnNkVFpEVWxKNk1XbFFhM05DT0hNMVdIZ3hNbVpuYzBseWJIVkdOekZDZFRoQ1ltSnFVR1ZaWTNsRWEwMXllRWRhWjFSM01HaG9ObFEyZUVSb01UVlRWSEZyZVdGVlprSTRkRTVKUVZndlZuWlNOR3d4WkdsR1JXdHVjbFJNZFc1UUt6aENObVp1TTBoNFdrWkxWVE5OUVRKcFZtSk1kekV4YVVNeFJXbzNSMmxwUmxCWFJVMXpjR0ZhYkdzMldsZENOMll5Wmt0bGJUbEhjazVZUkhaUFR6Vlhja2xFVlVsU1kwdGtkUzgwT0RCQlFXbElSMnhQVW5Wa0xTMU9RVlJrZFd0dWFESjFiM1ZQZVZZM01FbE9VbEpCUFQwPS0tYjE5Yzc0NDljYzQxODBmMzM3MWM5MmI0YjNiMjQ4MDAzYjQyZTNkZA==?cid=907959799
    • https://cardpayments.microransom.us/XVFVGUlluUjFZMWhXV0RWS2JFSTNjWE15ZGxFMWRVVmpRV2QxWlVzd2FVOVZOMFZ1YVU1TFZVaFZSV3BtT1ZodWMxWk1VRVJsTDNwNGRTOTJTVEU1Y2xaUVZqbGFlSFpUU0hCdlkxZEtXbTB3U0haV2NHRnNlbkprVUVOWlpFbE1SbE5CTlV0SldqQXhRbmxEZFV4NFNFSlhLMUZIYVVGNEwwNVdkRmRZVVdSRGFIQlViMUJyWmpsalJsQkhVVUZCWXpCNlZVODJibVJ0VlU4eFNuZFVZUzh3TjNvNGMxWTJPV001YjJvME5WZEpZa3B1Y1M5a1pXTlJNbGN4VmxrMkxTMUNVVGsyZDFaSFdEWmhWR3haUWt0VmNsTk1aVXAzUFQwPS0tN2I0Zjk0YzNjNTQ1NGQyZDY0ODhiYTA4ODkzOWQxMjlhYzkxYjEyMQ==?cid=907959799
    • 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
999626340fb10e04ee13f011ed7c375527b1c4f60f610191ef6f8576920efeac		 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
9b68c67d380528687f18ff8f978e5bd814ab6a9f938e02caf55fba1a858267c6		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103862 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off000196db.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x196DB 4575 bytes

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