Malicious PDF — malware analysis report

Static analysis result for SHA-256 23935871617a7284…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 20:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: defd48fbf1a51c34ad1d9ba1f4e1acc5 SHA-1: f731ce42d11f289a7b1d78e740b7b77e2e4e695e SHA-256: 23935871617a7284a9b869f51730cf94a0daf7caa24f88f8360eba223d14e18b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to a 'work excuse doctors note template'. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates 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://ttraff.com/wix?keyword=work+excuse+doctors+note+template
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/dupovurimixuremivipopijo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6873/3078/files/online_jpg_to_word_converter_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/42266466492.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/html_to_using_jquery.pdf
    • https://static.usrfiles.com/ugd/88a84f_97c3d2cb13ef41dba9622dce3d049a71.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7303/files/analytical_biochemistry_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/malayalam_cartoon_film_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/xosodisuzibu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/landscape_architecture_company_profile.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646d.bin
ba39dffd9459affec522081aaa22778299072ee9980f81f553d4b51bbe5c462b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646D 5364 bytes
font_01_sfnt_off000076a5.bin
c534fdaf22e0cf026ae3e8a30d41b773bd282a0b24f2002abcc1087d1577c8b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 10044 bytes

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