Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2d398557e85cbf…

MALICIOUS

PDF

47.8 KB Created: 2020-09-21 00:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 429b330e4ea08a5f87f168b8f026d06c SHA-1: c64dd75b1f6f6cfa4b63c1cf0a2ebd968dc458be SHA-256: 5f2d398557e85cbf927ac3a29d39ac046ad28062b2811b0df74acca05b9734db
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a product manual, aiming to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO manipulation tactic to obscure the primary malicious URL. No scripts were extracted, but the embedded malicious URL is the primary indicator of compromise.

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.link/wix?keyword=black+diamond+storm+375+manual
    • http://watixelo.uswlocal1-500.com/uploads/1/3/2/7/132740352/folofubivil.pdf
    • http://woworadep.pemun.org/uploads/1/3/1/0/131070351/vimogaduw-binabulubib-maked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/ciencias_naturales_cuarto_grado.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/89766998135.pdf
    • https://cdn.shopify.com/s/files/1/0432/9730/8840/files/5.2_multiplying_and_dividing_rational_expressions_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0455/4637/3285/files/ganoderma_lucidum_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/73083179314.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/advanced_excel_full_topic.pdf
    • https://cdn.shopify.com/s/files/1/0440/9176/8984/files/agressive_lesbian_porn.pdf
    • https://cdn.shopify.com/s/files/1/0429/6163/3439/files/49586334690.pdf
    • https://cdn.shopify.com/s/files/1/0437/4626/3201/files/45543444495.pdf
    • https://1041e7dd-524c-42b7-bea9-e8416b40ad1e.filesusr.com/ugd/625844_f1200dacc55d4f878953d91170ae28a5.pdf?index=true
    • https://3cadcf11-1e84-4238-b0cb-58a787ae43bb.filesusr.com/ugd/0a3240_ccba8e6d065e4f069243c9092a54f5da.pdf?index=true
    • https://0fffb673-8a32-4f47-96ad-9225d8414b7d.filesusr.com/ugd/44b221_6bc09035863f45bbb63047058fad88f6.pdf?index=true
    • https://ea6f493a-3f06-4a99-9b69-e04555a37538.filesusr.com/ugd/d55797_fbfdfb3b16d840a8a61e17b833817852.pdf?index=true
    • https://6ded8d75-e5b5-46b9-852e-ad8de9a1895f.filesusr.com/ugd/1c8c1e_3670c0dc4c1b4887bdf35add4a7947cb.pdf?index=true
    • 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_off00007b55.bin
5a1e86da8b49b369f340055daf7929efa21ec37614e3ab7a4e238840cb4b6944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 5564 bytes
font_01_sfnt_off00008e32.bin
565805f00edac0a372868be463364004856dda34bfbb5b3279a3bdfe0d02a5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 10572 bytes

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