Link annotation not properly identified

When reviewing the attached PDF, there is a picture that can be clicked on that goes to the Adobe site. However when checking for Annotations use Aspose.PDF, the Annotation type is not returned. I see a blank description for the type. Below is the sample code:

        private static void AnnotationLoop(String inputFile)
        {
            using (var doc = new Document(inputFile))
            {
                if (doc.Pages != null)
                {
                    foreach (Page page in doc.Pages)
                    {
                        if (page != null&& page.Annotations != null)
                        {
                            foreach (Annotation annotation in page.Annotations)
                            {
                            }
                        }
                    }
                }
            }
        }