Malicious PDF — malware analysis report

Static analysis result for SHA-256 517fcf613e9d1065…

MALICIOUS

PDF

41.2 KB Created: 2020-10-25 22:35:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 63e60664f6943162fa27e3914fccbda4 SHA-1: 21a14f6af7a78ef96bcb88749846a0de54482b49 SHA-256: 517fcf613e9d106518622d9c00dab88da747a5ba8e9a79b77ce8018bcd001660
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign content, but one critical link directs to a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to funnel users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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://cctraff.ru/strik?keyword=spirited+away+piano+sheet+music+sixth+station In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f8a32ef30104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5f91c8453e140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5f915eca3f2e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f9267238187d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5f942b157983c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8e24c1a8c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f9244426f640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f92b52cc55e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5f8aec8ba63ae.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/9208443.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/a96f6607b4d8.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/9591872.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/9384386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05dd210-a44f-4f0c-ae4d-79accc353072/kotevubati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80fdb12-4eca-4dd6-bc9c-fb13e253189a/dejadiwidomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f20e47a-0ef9-4f88-b9c2-145fc9574294/52500499224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cef0167-8f71-4ea0-8b05-b28b66178738/86733385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/gaziwosofuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6240/1459/files/bcom_hons_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7376/3496/files/rolofepixuwudubevilebaruz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4390/4408/files/surviv.io_2d_battle_royale_apk.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_off00005c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7A 5644 bytes
SHA-256: abf3705fcf85be3004c75f2d0efa6cbf8d217dd7d74aeb0917e6cb07dfb9e407
font_01_sfnt_off00006f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F96 11160 bytes
SHA-256: a76c4cbc9b625bfd5302bc64412459e4b74239c7aac8b8fce89bac18f07e7f82

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