Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdb5e391885756a…

MALICIOUS

PDF

29.0 KB Created: 2020-04-14 08:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2449ec9a10f61d7b360c8838cf6ebe7e SHA-1: 0ea6e6a0a305a2fd754fbd4018eb69a4bc1a04ea SHA-256: 9cdb5e391885756a00b420afddc1249bb086b809e6dd8708a708a05a7370ff6a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to PDF files with numeric or nonsensical slugs on various domains. This pattern is indicative of SEO spam or a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the embedded URLs leading to other documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://msgarletts-hancock.com/uploads/1/3/1/4/131453565/131453565.html#bollywood+movies+free++hd+print
    • http://honeycuttengineering.com/uploads/1/3/0/6/130621853/sejaxiwixetigeratoju.pdf
    • http://10000licks.net/uploads/1/3/0/7/130738567/21156.pdf
    • http://sftutoring.org/uploads/1/3/0/6/130640031/metovep-tidalol-wevelimepama-xagiwituviwep.pdf
    • http://peacefullivinghealth.com/uploads/1/3/0/6/130621896/29106a52a085.pdf
    • http://parkerstateman.com/uploads/1/3/1/0/131071277/wosonemizewa-marufin-wesobuzamo.pdf
    • http://flyinamerica.com/uploads/1/3/0/2/130288310/3924744.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_off00004dd4.bin
18b36d4ee80cc589850e63bc70b6babaeb5a2a722633c5c4043e03fcc1727c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD4 6684 bytes

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