Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3bc4d0cef57e7d…

MALICIOUS

PDF

76.5 KB Created: 2020-03-26 02:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5922a8601087e9bc66ab7402069549c SHA-1: c3ec6b5e4185343bebdda4e3c6854629150187d1 SHA-256: ce3bc4d0cef57e7d8a0f4bad93c4bf495176a175a22c8ebc9534662e670b44ee
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary link directs to 'bytecubed.io'. This suggests a tactic to manipulate search engine results or to distribute malicious content through a link farm. The ML classifier strongly supports the malicious verdict.

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://bytecubed.io/uploads/1/3/0/4/130483109/130483109.html#derecho+constitucional+pdf+argentina
    • http://resurfacetechnology.com/uploads/1/3/0/6/130604823/kugurawumodaj-xefarosaxurasen-zegofukapadut.pdf
    • http://ssbcmarketing.com/uploads/1/3/0/3/130379408/puliwopavapezibavuju.pdf
    • http://galerielewis.com/uploads/1/3/0/8/130813524/sakeme_pumezajus_dogijupozu.pdf
    • http://mx.charlesilyesfamily.com/uploads/1/3/0/6/130604175/9130469.pdf
    • http://sarcanines.com/uploads/1/3/0/6/130640146/1954900.pdf
    • http://hostmaster.lifeisforlivingshow.co.uk/uploads/1/3/0/5/130545475/1722910.pdf
    • http://hostmaster.nationaleschoenmakersgildeweek.nl/uploads/1/3/0/7/130740044/nutixuvubedade_gofumatojew_tetibifuv_lufuwigejedezok.pdf
    • http://hydrographics.ca/uploads/1/3/0/6/130621094/mozilukagopiribovid.pdf
    • http://www.megan-roberts.co.uk/uploads/1/3/0/6/130621664/6286214.pdf
    • http://leahritchey.com/uploads/1/3/0/6/130604358/2100665.pdf
    • http://www.urban-healthcoach.co.uk/uploads/1/3/0/7/130775951/sapulizorizobagijire.pdf
    • http://wukun.com/uploads/1/3/0/6/130639518/subavinid.pdf
    • http://alovida.com/uploads/1/3/0/2/130289570/visijaw.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_off000104b7.bin
53455df026df07620c20697613c7064c78a452e254fe30ee03dc269b68db9efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 8868 bytes

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