Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abc36929fb20ea1…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 14:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05f209fc8e5f3acd4413dccbf3e7e814 SHA-1: 11ffb752e8668ff618ee83f9f7187daa1410f785 SHA-256: 5abc36929fb20ea10d933bcd97e0908bfac1edba0be7651e90998dc60e106194
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector infrastructure. The primary malicious link, disguised as an 'Avon catalogue', leads to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to drive traffic to potentially harmful sites.

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/wix?keyword=avon+catalogue+july+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.pdf
    • https://static.usrfiles.com/ugd/b8c837_09a1505ba1864445ae4780b5e3ee6aca.pdf
    • https://static.usrfiles.com/ugd/f1d680_3b1e305215ef4c8ababc662031fbd58b.pdf
    • https://static.usrfiles.com/ugd/0dd040_c0b4f5880224441e8b63b858e8aebcbd.pdf
    • https://cdn.shopify.com/s/files/1/0466/9007/4788/files/simplification_and_approximation_for_ibps.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/cash_flow_budget_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/autosar_architecture_layers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/jabakes.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/princesses_don_t_cry_song_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_9599c60740ff48cdac87776bd4b89d47.pdf
    • https://static.usrfiles.com/ugd/b8c837_60ea1bff23664044a014429b477a79b6.pdf
    • https://static.usrfiles.com/ugd/b48b60_e6cfd4de9bbc42429ed0344d42840703.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bf4dab0dfd444e192a58c4f1850617d.pdf
    • https://static.usrfiles.com/ugd/a4e402_67b803093b12466eaee2f3e09d520607.pdf
    • https://static.usrfiles.com/ugd/8ab72e_5a631c17e1614cf0826deed67bb88dee.pdf
    • https://static.usrfiles.com/ugd/fe83c3_f20e9b48c644411cb23dd7095230b901.pdf
    • https://static.usrfiles.com/ugd/7d21c0_0d1c6f6cd1314b7096a5cab099423cd8.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_0aaf90049ba74f23b28e7c37f433b254.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_off000069d3.bin
cacf4a65a3d153594e386af6aca0bae015e9e79dda600cc2f8d87c5c6e7d8c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D3 5400 bytes
font_01_sfnt_off00007c60.bin
326d133f76e7c17de1658263b5369c923f7da8f273fd30e7f658fbfa95c72efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C60 10016 bytes

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