Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d0c83cc2cc8562…

MALICIOUS

PDF

48.2 KB Created: 2020-07-10 04:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2151b1b3d6bd9ac8c9ec7b0a016454f7 SHA-1: 55462f46e3c802b0ab998b170b7432c4bc5a1f8f SHA-256: 13d0c83cc2cc856261324d1f2bd4dfb4a585c735579762bb3ba1f736b521a8b9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of many SEO-like PDF links suggests a link farm designed to distribute malicious content. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially harmful URLs.

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.ru/wb?keyword=primitive%20skills%20and%20crafts%20pdf
    • http://files.mustbefrenchies.com/uploads/1/3/1/4/131437880/saroxolufoni.pdf
    • http://files.kielbasablog.com/uploads/1/3/1/3/131382141/8919209.pdf
    • http://files.scrapbookconciergedigital.com/uploads/1/3/0/8/130813897/6317370.pdf
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://files.southlyoneastboysbasketball.com/uploads/1/3/0/7/130739926/nifukekuxawofix.pdf
    • http://files.torreychambermusic.com/uploads/1/3/1/3/131379381/eaa6407ce7e2.pdf
    • http://files.mayusilkart.org/uploads/1/3/1/3/131383664/2245704.pdf
    • http://files.sparkmanconsulting.com/uploads/1/3/1/4/131438629/74671815bb508f.pdf
    • http://files.paulsfranchiseleague.com/uploads/1/3/1/4/131438249/kabuvoxije_kuvorenuzixuw_raxejusub.pdf
    • http://files.laboniteca.com/uploads/1/3/0/8/130813516/e0fdd9.pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • http://files.marktwainmapleworks.com/uploads/1/3/1/1/131163635/9009074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://segumivez.files.wordpress.com/2020/07/pejuvetipufaseraxoni.pdf
    • https://pajovoxexula.files.wordpress.com/2020/07/26978634513.pdf
    • https://duvuzeso.files.wordpress.com/2020/06/22757558204.pdf
    • https://fisajisekik.files.wordpress.com/2020/06/rabedolafekep.pdf
    • https://mutemugefe326949004.files.wordpress.com/2020/06/dopurem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pegumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bijuwosozawubuvenokuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008018.bin
2e4217e01d65ede3b9ffd37fb4e71498f3235375e42c8a870710861251ad4faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8018 5104 bytes
font_01_sfnt_off0000915c.bin
678537cd1ee285b3a3f798529d5adc495d8c314fe0647d31dcdcbcb1e8213ff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915C 10060 bytes

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