Malicious PDF — malware analysis report

Static analysis result for SHA-256 494da88f53ad7bf3…

MALICIOUS

PDF

38.8 KB Created: 2020-04-07 14:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f845724042164043c697cfb97044499e SHA-1: f437086c9b2fc0f411f604942db854099208018d SHA-256: 494da88f53ad7bf39a11a7b2dbffd5155fe4d808b92661b12a28778a69be9b4a
94 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 similarly structured PDF files on different domains. This suggests a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. The primary attack pattern involves luring users to a network of SEO-optimized PDF files, likely for malicious redirection or content delivery.

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://milkweedflora.com/uploads/1/3/0/2/130287500/130287500.html#rubrica+para+evaluar+escritura+en+ingles
    • http://effloraison.fr/uploads/1/3/1/4/131438293/9885669.pdf
    • http://westwoodmusic.ca/uploads/1/3/0/4/130493248/6cc7769eb5.pdf
    • http://thebiggestlittleswimschool.com/uploads/1/3/0/5/130541846/bd65f6395c45e.pdf
    • http://chitowngala.com/uploads/1/3/0/6/130621131/xifamuza.pdf
    • http://sarahsimmonssings.com/uploads/1/3/0/7/130739250/babet_navaniwemif_genegirisagovup.pdf
    • http://littlebigfootrabbitry.com/uploads/1/3/0/6/130604767/4896321.pdf
    • http://digitalskillsgroup.com/uploads/1/3/0/7/130739956/cc8b77de70f3d7.pdf
    • http://oaespto.com/uploads/1/3/0/6/130620612/991357.pdf
    • http://sunfamily.xyz/uploads/1/3/0/6/130604533/2463657.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d4.bin
15b909d94f17177d223624adbe40ccc2538ca7643b7883c24c90fd326634533a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 9160 bytes
font_01_sfnt_off000083dd.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DD 1708 bytes

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