Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd5db4d064c24a3…

MALICIOUS

PDF

42.9 KB Created: 2020-10-30 14:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e92d8dcd4acc25b6d9b9200f867ec599 SHA-1: cd1330acfb945ac11c89ff50c2567f8e58965211 SHA-256: 8bd5db4d064c24a3b9c5f9e77ef95053dd1b48a5db92eb1ddf450c01dfd27758
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/123?keyword=craigslist+spokane+bikes'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a harmful site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 https://ttraff.link/123?keyword=craigslist+spokane+bikes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f89507608775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f954af029326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f98c07bd02b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5f9801a9ad2de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f94abd7228d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0301/8918/files/82263518303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9720/3894/files/vepedogumavudexuzebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0110/0464/files/layer_poultry_farm_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/38130661145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e45a69-0618-45c5-be7d-2012a3ecbb03/40366751696.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/convert_30oz_to_cups.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0254/3261/files/toyota_way_service_excellence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3281/1957/files/harvard_referencing_guide_university_of_hertfordshire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ad66ab-332c-4ef2-88d3-84ce9b7d9e00/blbln_krk_arks_iskender_pala_zet.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/bible_study_lessons_tagalog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000668e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668E 5096 bytes
SHA-256: 2bae91035c3b0b432450f21251748e0b17ef3ca406b60f95a12627a6eef39a30
font_01_sfnt_off000077eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EB 12032 bytes
SHA-256: f76eceafb8fde8a0e85239edf149203340587fc7a642e12fdccdd46d4f95497d

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