Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6cd530f2daee39…

MALICIOUS

PDF

42.2 KB Created: 2012-10-18 03:22:13 +04:00 Authoring application: http://www.instructables.com (via mPDF 5.0)
MD5: 0144c3bc864d9e31659047d52b99af2f SHA-1: 3a803e804cacb2334fa1721e0ed1e9c839f34e82 SHA-256: 6c6cd530f2daee395bc4c4c25e59b900543bdb428abc01c52fc6aa4b03c0ed22
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript that utilizes the getURL function to redirect the user to 'http://wwwsearchsites.com/in.cgi?10'. This behavior, combined with high-confidence ML and heuristic detections for obfuscated JavaScript and redirectors, strongly suggests the document is designed to lure the user to a malicious site. The primary purpose of this redirection is likely to initiate a download of a malicious second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • Obfuscated document JavaScript getURL redirector high PDF_JS_OBFUSCATED_GETURL_REDIRECTOR
    PDF document-level JavaScript automatically calls getURL() on an HTTP(S) destination hidden behind percent escapes. The decoded path is a redirector-style endpoint such as /in.cgi or /go.php. This is malicious routing behavior rather than a PDF parser CVE.
  • Suspicious extracted artifact medium 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.
  • 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.
  • 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 http://wwwsearchsites.com/in.cgi?10
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0029_000.js
8139b0ff1cb1654f40fa2e0f4917ed84cccbab34fc1337b3c5ec2c588eb4b083		 pdf-javascript-stream PDF /JS object 29 at offset 0xA21A 130 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).
stream_003_off00001a16.bin
dcd1ba64d747e0bf0b9b8ecc270a7bea07ca4cd5917a768cd217f1d51287033b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A16 17772 bytes
font_01_sfnt_off00004831.bin
a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4831 17892 bytes
font_02_sfnt_off00007671.bin
4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7671 18720 bytes

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