Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e05009f36d494c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-25 07:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c30fbb472c3b3ed8b9e1bc48e91056f9 SHA-1: 618fb10736b6f34ff8b73769f48be6a8a05e18b0 SHA-256: 18e05009f36d494c6467bc26c16f2c10a3af455897958c00f27aed49ebfca849
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 of which point to external PDF files hosted on various domains, including a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to malicious content. No scripts were extracted, but the structure suggests a link farm designed for SEO manipulation or to host malicious content.

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/pify?keyword=target+khaki+uniform+shorts
    • http://files.eastdulwichmummy.com/uploads/1/3/1/3/131381555/2480f4cedc31f.pdf
    • http://tunuragu.apextravelogue.com/uploads/1/3/2/8/132814956/0f32dbbbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/wibasefapekomodugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7742/5565/files/26397613210.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/novoxejexogenoxozomeguxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/52468293932.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/zukelugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0970/3061/files/28451178799.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/apuntes_perspectiva_caballera.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/wavelet_transform_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4199/files/amharic_alphabet_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9778/files/crayon_box_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/birewekovoninajaj.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_off00006195.bin
515c08cc2f586d7e9364d62c3de99cfbbb28c2a0678aeec7265ea3642888d700
pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 5164 bytes
font_01_sfnt_off000072fd.bin
a0fedd680df3c2254bc2c8214696196ec94d72e124273c099de023db4d03e6dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 10652 bytes