Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672fad77727d68c…

MALICIOUS

PDF

37.4 KB Created: 2020-05-22 17:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea6fc1c7ff61a06bb121fd8accca568e SHA-1: b6670b8e42175601ac8300228b473758ccc15edd SHA-256: 7672fad77727d68cf5e2afe9dc5b2dff75ba8188fbc601d15debf4a86e9e4a4b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution network. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. No scripts were extracted from this sample, but the extensive link farm points towards a malicious intent, possibly for SEO poisoning or to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://optimalagingllc.net/uploads/1/3/0/8/130874252/130874252.html#les+100+pdf+kass+morgan
    • http://pastaamorerestaurant.com/uploads/1/3/0/9/130969682/5254106.pdf
    • http://westchester-modern.com/uploads/1/3/0/8/130814252/bcd4c5a42.pdf
    • http://dancaela.com/uploads/1/3/0/5/130550969/veduxobojuxas_kuboravoritaw.pdf
    • http://morogmie.com/uploads/1/3/0/8/130814902/3553135.pdf
    • http://handgunn.com/uploads/1/3/1/4/131455621/zinologesa.pdf
    • http://2creeks.biz/uploads/1/3/0/3/130312972/mufoketeg.pdf
    • http://infinitywindowsdoors.co.za/uploads/1/3/0/2/130289702/fdc0ecb7bcdf28.pdf
    • http://insroofresources.com/uploads/1/3/1/4/131453249/2196739.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_off0000620f.bin
42ccc34f979aeb4087a4d8abe2ba963ee9d239066bc36e7a6921dd76ebcff2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620F 13124 bytes

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