Malicious PDF — malware analysis report

Static analysis result for SHA-256 687dba9693f729ba…

MALICIOUS

PDF

46.8 KB Created: 2020-04-08 01:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1919cb1bb151b37ab6e25074b6698531 SHA-1: 7b5e2e9987a3017c25829194ac126488b12534e7 SHA-256: 687dba9693f729bac335466b1cb9687aaca5441b0fa1b68503582881867e35b3
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to host or link to numerous other documents. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://loweslake.com/uploads/1/3/0/7/130739928/130739928.html#dragon+mania+legends+legendary+breeding+guide
    • http://booktherapynyc.net/uploads/1/3/0/7/130775387/tamovefoxufibu.pdf
    • http://cambis.net/uploads/1/3/0/9/130969722/bad739c3674b.pdf
    • http://outwardchurchmedia.com/uploads/1/3/0/6/130639998/bakewiwomubirapad.pdf
    • http://gbritsolutions.com/uploads/1/3/0/5/130588370/4581157.pdf
    • http://tofinoucluelethomecare.com/uploads/1/3/0/9/130969973/6382959.pdf
    • http://gavrochegames.com/uploads/1/3/1/4/131453175/a0edb27f5.pdf
    • http://uncleguidocito.com/uploads/1/3/0/7/130739308/4431389.pdf
    • http://originalstandard.org/uploads/1/3/0/6/130639164/dd4a470e781364.pdf
    • http://sacredcirclecounseling.com/uploads/1/3/0/3/130379757/8693882.pdf
    • http://scentamor.com/uploads/1/3/0/9/130969336/cdd06.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079e8.bin
288aa7adbf2b7604ccd3e7847bfe7b43d9e3385745ac02c09d8992df708b718b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E8 8120 bytes
font_01_sfnt_off00009912.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9912 16036 bytes

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