Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb564e8f84423b6…

MALICIOUS

PDF

39.0 KB Created: 2020-08-14 18:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c357039ba13f918d7389c56be6efe28e SHA-1: 9edff280a2391787730f3dc98400c6e086f1abc5 SHA-256: 5cb564e8f84423b645353eafe0a95eeb8157f79f05e480a2e034d530e05f8115
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

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/pify?keyword=letter+format+for+teacher+job
    • http://files.blboutdoors.com/uploads/1/3/1/6/131636969/wutaveluxorunulenap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/4611209545.pdf
    • https://cdn.shopify.com/s/files/1/0429/6635/2025/files/45655976772.pdf
    • https://cdn.shopify.com/s/files/1/0452/3815/7472/files/banking_act_2020_act_673.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/jizolagerogaguwujeral.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demotufilonameviv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7745/9365/files/gezodefaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/weekdays_in_a_year.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0141/files/97025348239.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_off00005c25.bin
c5a1fc7b6ab85f53eda8a8713ceee950bf8fac9fe634ca6969eaad301b8916ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C25 5068 bytes
font_01_sfnt_off00006d4b.bin
2efefa17147b017c98c89c95b6fa5fb28b4a580fc83dae157d5e5c6b6a1e6a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4B 10116 bytes

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