Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed02f886629d40bc…

MALICIOUS

PDF

38.0 KB Created: 2020-04-10 06:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de6256c880577a9d252a269b84d7dea4 SHA-1: d020625c91509d077af23c875883413d8b06fc52 SHA-256: ed02f886629d40bcf47badea74cff917cbbe8404b4dcbe7ad1571ce4e4ff01d5
94 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external PDF documents hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern involves directing users to a network of potentially malicious or spam-related PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lifteens.com/uploads/1/3/0/6/130621979/130621979.html#caracteristicas+de+pollo+de+engorde
    • http://laurenrique.com/uploads/1/3/0/5/130550914/e6091f4a39.pdf
    • http://pieceofcakecupcakes.com/uploads/1/3/0/7/130776854/popatukisuter.pdf
    • http://spurhq.com/uploads/1/3/0/6/130605216/509966b403c77.pdf
    • http://fes-tx.com/uploads/1/3/1/4/131414358/f2c993acda.pdf
    • http://puzzleofthelamb.com/uploads/1/3/1/1/131164387/gomonu.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_off00006aa7.bin
7ef4127116eb5cfd3c7e4a9b04b12e856f4da7f651cc40b6d7b1ea765cebcd75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 8620 bytes

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