Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf72f3dc6986cfae…

MALICIOUS

PDF

48.0 KB Created: 2020-06-03 03:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 250ed9ec92b96e962c5022157a4ff83d SHA-1: f9ccc6f17a5175c3e85afbb9598f8d2801928260 SHA-256: bf72f3dc6986cfae00ce47b7f47409d1afadf392192d9ba6caf3c017d2d0bfdd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The primary lure appears to be a link to 'minute frontier guide' which redirects to a page with numerous other PDF links. This suggests a campaign focused on SEO manipulation or distributing a large volume of potentially malicious content through linked PDFs.

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://apexwalls.org/uploads/1/3/0/6/130620974/130620974.html#minute+frontier+guide
    • http://study-to-success.com/uploads/1/3/1/4/131482988/3335042.pdf
    • http://nagconsulting.net/uploads/1/3/0/6/130605258/kapeta.pdf
    • http://shootouthoops.com/uploads/1/3/0/2/130272364/wulukukexisivezorasu.pdf
    • http://4nn.undesirable.us/uploads/1/3/0/6/130603906/povupodilugisutito.pdf
    • http://mojopix.net/uploads/1/3/0/5/130551338/vabusubedut-sipinivixexab-vuxobujiveni.pdf
    • http://ahceite.com/uploads/1/3/1/6/131637313/3241611.pdf
    • http://gerardgueguen.com/uploads/1/3/0/6/130639583/fopugo.pdf
    • http://jacksoncountyiowatourism.com/uploads/1/3/0/7/130740508/4961846.pdf
    • http://apexwalls.org/uploads/1/3/0/6/130620974/terms.html
    • http://apexwalls.org/uploads/1/3/0/6/130620974/dmca.html
    • http://apexwalls.org/uploads/1/3/0/6/130620974/policy.html
    • https://bujavam.files.wordpress.com/2020/05/63558075988.pdf
    • https://pekizov.files.wordpress.com/2020/05/zokowetuxuridarixujo.pdf
    • https://womumugitas.files.wordpress.com/2020/06/tesida.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_off000090ee.bin
95efc49c4499d8045d1ac291a1d2e87b5ff213c8b481550a88ec75599066e2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90EE 10312 bytes

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