Malicious PDF — malware analysis report

Static analysis result for SHA-256 736ecd7018773d1d…

MALICIOUS

PDF

28.5 KB Created: 2020-04-26 03:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a0426e878e18313cdfb3394d501d61ad SHA-1: 9cb4a81f7753de68f2eb41c1fd30532cc9f67a88 SHA-256: 736ecd7018773d1d002a193ee9edde268a949c1e3809a652e3316b53eb922612
96 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs. The primary purpose appears to be directing users to a collection of external PDF files, potentially for malicious purposes such as hosting further malware or engaging in SEO spam. No scripts were extracted, but the presence of numerous external links suggests a potential for T1059.007 (JavaScript) if these links were to trigger malicious scripts in a browser, or T1566.001 (Spearphishing Attachment) if this PDF was delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://bettyswaner.org/uploads/1/3/1/4/131409009/131409009.html#cyberpunk+2077+trailer+4k
    • http://weldersunion.org/uploads/1/3/0/5/130550672/pekoverejodosi.pdf
    • http://aastyling.com/uploads/1/3/1/3/131383329/a22ac168a3c98a.pdf
    • http://snoonubeats.com/uploads/1/3/1/4/131437364/a8b5e397.pdf
    • http://journeytowanderlust.com/uploads/1/3/0/5/130550684/vipebo_febozenujoge.pdf
    • http://freerunla.com/uploads/1/3/1/3/131383476/fifak.pdf
    • http://liberateconference.com/uploads/1/3/0/5/130588289/lokeme.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a36.bin
6f6baf606413acd8d22cf768228883de15796643e42e87acf7bdc7631ad53f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A36 7236 bytes

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