Malicious PDF — malware analysis report

Static analysis result for SHA-256 75832f5d217f62aa…

MALICIOUS

PDF

40.2 KB Created: 2020-11-01 10:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e595592f274912ba77fd36fb6d7ae567 SHA-1: d61649f5b3254a224f5e1d4af575b0b755620794 SHA-256: 75832f5d217f62aa0768b91b938dc004cc74559929e6dc8f8d7a0943d200d935
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.
  • 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.cc/123?keyword=ti+84+calculator+online+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5f9d05de018a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f925ee25fa96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5f9048481b509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f8e8d3bcbe39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f93e2a0c3916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_5f8aaa5230c98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/applied_cryptography_bruce_schneier_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/maniac_magee_summary_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc788581-e98d-4fb1-8fe2-f0380fba12c9/traffic_engineering_4th_edition_solution_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/48667157391.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/83554966399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1809/0172/files/zifapizobilexeda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x530F 5044 bytes
SHA-256: 8a0b3d529c1dfd2ee78d5561ca14fbe3e0c0535404b347565039ed6188ecb97f
font_01_sfnt_off0000644c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644C 9780 bytes
SHA-256: d32f3664455f917564c05195dd686ecf5c262891179493bec59ef2bb81dc721f
font_02_sfnt_off000085ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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