Malicious PDF — malware analysis report

Static analysis result for SHA-256 95264f1c7d6dc98a…

MALICIOUS

PDF

36.2 KB Created: 2020-10-09 13:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 56a5ea36205635db6ff8e57a28c05dd5 SHA-1: 57912d80bd30d60cfa8c42f563a4a6d8148bc178 SHA-256: 95264f1c7d6dc98a3b7726a73f88bfc9ed80af09ac44977cfdf9c24bbfd70fd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a nonsensical document body and numerous embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=my+dog%2527s+favorite+toy+is+santa In PDF document text
    • http://faxud.istanbulsanatlayasam.org/uploads/1/3/1/4/131454215/855119.pdfIn PDF document text
    • http://nijijopa.apriloliviaroskos.com/uploads/1/3/0/9/130969060/zojiduz_sarabaji_danoriku_fujetu.pdfIn PDF document text
    • http://wupora.rosiehookeryoga.com/uploads/1/3/1/4/131437940/kirufinag-bujafev-mijazuw.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/b81a94fa-ed12-479d-b9f5-48e43d86f320/pexifiledesapulererebigap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1e85ce-f3ba-4980-a92f-121d7919470a/5014492602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0cf72b-a6f6-41e0-b8cf-8766dc7d0ef0/nedaxupexedopujokos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8865/0146/files/60945690117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbcb1caf-3d0f-4870-8680-413b8f3393aa/54420164819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd57f3fa-331c-42f7-8ae4-b806346cac28/xojadijezodexabaliko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2e281b-3381-435b-97c8-68987e04c562/7499305789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe042db3-52a4-4cbf-8425-696852058782/posapefibupuvizuvazavufop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fafaad96-4a66-48d5-b940-08c771eb7f1a/55998559827.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_off00005075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5075 5244 bytes
SHA-256: 09ebb32a5e4501ea3a1f87f593c750969fe8820d3772214cabc1456a4b065c5f
font_01_sfnt_off00006280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 9864 bytes
SHA-256: 2580cbc5799fe84a64a39984a78c3ce957da12546ea40d78258958f776c130b7

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