Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fd181416b603cc…

MALICIOUS

PDF

42.4 KB Created: 2020-08-15 06:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d767851c0fc799a0254611e24d5b047 SHA-1: 18180981f8cc0f81070f77b99d628d6ab54ebf89 SHA-256: 72fd181416b603ccfc4d3f7a138a676bd73eef0065b7fa46a2f16b959074d501
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though corrupted, also contains the URL for the malicious redirector, suggesting an attempt to lure users to malicious content. The presence of many Shopify links indicates a link farm strategy to improve SEO for 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.ru/wb?keyword=clear%20blue%20ovulation%20kit%20instructions%20pdf
    • http://neluwemon.surfcoastarts.com/uploads/1/3/0/8/130874523/4117318.pdf
    • http://files.fromthelighthouse.org/uploads/1/3/2/6/132695472/682935.pdf
    • http://files.reclaiminghopecounseling.com/uploads/1/3/0/7/130739835/toledo_zagazimo.pdf
    • http://files.bwilcox.net/uploads/1/3/2/7/132740951/tobosor.pdf
    • http://files.antonio-oliveirafilho.com/uploads/1/3/1/3/131384424/5974434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/high_school_graduate_resume.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/77211566348.pdf
    • https://cdn.shopify.com/s/files/1/0445/6418/5247/files/cours_de_chinois_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8714/2818/files/92095105040.pdf
    • https://cdn.shopify.com/s/files/1/0440/3272/1046/files/64037282786.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/64764980765.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/gujoles.pdf
    • https://cdn.shopify.com/s/files/1/0437/2925/6613/files/49593708924.pdf
    • https://cdn.shopify.com/s/files/1/0430/4892/7386/files/gufulunekinepale.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/cambridge_igcse_maths_student_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/convert_word_doc_to_fillable_free.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_off00006695.bin
3c9b6eeace07b8923c226e0ae99ff3736460db3d8f4c61a5e9fe157aa5cfde88
pdf-font-stream PDF embedded font (sfnt) at offset 0x6695 5320 bytes
font_01_sfnt_off000078b7.bin
045e678b572a1a5971b5d8833d90fb6cc91592a59ede43b92c0e4d39f80b6f19
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B7 10416 bytes