Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52203a1a7540852…

MALICIOUS

PDF

32.3 KB Created: 2020-05-17 23:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d75f7e91dd426f6dee8f874b92d8ec4d SHA-1: 3a2be6aa02f7d8f5fd9fd2e4903c12102493f9bd SHA-256: e52203a1a754085297c37234e74131c7c3863f6b8f23c1b33d88426ee3ed1d82
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDFs hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of numerous numeric and keyword-stuffed URLs suggests an attempt to manipulate search engine results or distribute malicious content through a network of seemingly innocuous documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://weatherproofguide.com/uploads/1/3/1/4/131483184/131483184.html#browser+apk+mod
    • http://pinsngifts.com/uploads/1/3/0/6/130605357/7203816.pdf
    • http://obsessiveonline.shop/uploads/1/3/0/5/130589264/kufedazulabid_xenatejoru_getegiwa_ritibowetub.pdf
    • http://twwoodgallery.com/uploads/1/3/0/7/130775897/kidilatel_tibudo_lefesopinabu.pdf
    • http://seantraceymusic.com/uploads/1/3/0/7/130775456/gavoj.pdf
    • http://globalvipmobile.com/uploads/1/3/1/6/131606472/8225842.pdf
    • http://amarihthaibeautycenter.com/uploads/1/3/0/7/130740062/d3dcda9614338f.pdf
    • http://trajavallc.com/uploads/1/3/0/4/130488197/lufimak.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_off000050ca.bin
dc16b5de43e6e5eccfb20991a08669e1094b31c1996e965192c4082f0d524c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50CA 10676 bytes

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