Malicious PDF — malware analysis report

Static analysis result for SHA-256 603545164326a4b7…

MALICIOUS

PDF

39.6 KB Created: 2020-08-15 01:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50c79a553def7d1401fafeb7138d648e SHA-1: a8c4a49064d757201654e65c5f522762fd4ec368 SHA-256: 603545164326a4b764e3e2614a31414b638e05c3853626824857f57526cf5c20
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and numerous links, including one to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the embedded links suggest an attempt to redirect users to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attempt.

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/pify?keyword=should+you+clear+cached+data+on+android
    • http://bolaxok.pca-az.net/uploads/1/3/1/4/131408999/527171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/jafubaresuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/comment_lier_plusieurs_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0440/6152/4118/files/39399252342.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/cormen_for_design_analysis_and_algorithm_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/binary_search_algorithm_in_c_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/82914422573.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5068/files/marathi_inspirational_quotes_on_life_challenges.pdf
    • https://cdn.shopify.com/s/files/1/0447/9467/5357/files/como_ligar_por_whatsapp_descargar.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_off00005e71.bin
f8582469d9b6b175209239582ac7fe81bf1db738b3686846cd3066b9573f787c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 5052 bytes
font_01_sfnt_off00006f96.bin
90a4795d3cfb999f53abce35f5ef917e7fcc2f06be9fa75db541daf0d10c39c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F96 9988 bytes

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