Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c7684827fcb06d…

MALICIOUS

PDF

31.5 KB Created: 2020-05-27 04:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32fa39106bac52800adff0b4e9d0da51 SHA-1: 2db5417b1e509a496198698f1db48e6318d49ee8 SHA-256: e4c7684827fcb06d411e8be395234a7990f720174a241cb900ee98d7573964da
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 to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also repeats some of the URLs, suggesting a lure to external content. The primary attack pattern involves directing the user to a link farm, likely to distribute further malware or engage in SEO-based scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maeganprovan.com/uploads/1/3/0/4/130476970/130476970.html#ficha+tecnica+de+losacero
    • http://firstlove.biz/uploads/1/3/1/1/131164007/b6e3999cc2.pdf
    • http://westcountyeyecare.net/uploads/1/3/0/5/130540700/bugetazefow_xonikemivanew_dulunuweta.pdf
    • http://mcveystransport.com/uploads/1/3/0/7/130739431/tolumesiduzuguna.pdf
    • http://lluxuryllama.org/uploads/1/3/0/6/130639805/tonomomite.pdf
    • http://leticia-rodriguez.com/uploads/1/3/0/5/130589286/buduloludo.pdf
    • http://langnerstormspottinglss.org/uploads/1/3/0/4/130476351/f4d3ed0a27744af.pdf
    • http://roswellinfluencers.org/uploads/1/3/0/6/130621503/f25e736d.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_off00004d1f.bin
dc13ffcad1888bcada0493ca5b015557db34a0be3f392d7b58d0dc0e11b36884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1F 11256 bytes

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