Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8b4a2783fe50f6…

MALICIOUS

PDF

44.6 KB Created: 2020-08-31 08:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fcf011612ceb8bfd5fb0c33ea0c5d0f SHA-1: 63b1c1dc10cccf4858b07799321d40c23d0ac82c SHA-256: 0f8b4a2783fe50f66ac2e43a894153e5e9500d726bdbad6aac834e68dc37caaa
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=cassandra+clare+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to external PDF files, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body contains obfuscated text and the malicious URL, suggesting an attempt to disguise the malicious intent.

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/wix?keyword=cassandra+clare+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1828/8284/files/41886863244.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/73612273621.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/papers_please_achievements.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/tupikubeganewewavo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4631/2863/files/filmora_template_birthday.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/56796452985.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/mazikenaxuxojatujet.pdf
    • https://static.usrfiles.com/ugd/e5a943_65bf504bbc6f439f88b7e549a368c730.pdf
    • https://static.usrfiles.com/ugd/b8c837_8432177643f44956bbf81b136dba065b.pdf
    • https://static.usrfiles.com/ugd/99965f_93f5af7577d841cdb6fe420424195760.pdf
    • https://static.usrfiles.com/ugd/704566_775876081c744d2e917f9274ad44c583.pdf
    • https://static.usrfiles.com/ugd/fb83f1_17d688babc874de4bf57944d826f9ad9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4100a99324054c1783948dde4ecb7c1a.pdf
    • https://static.usrfiles.com/ugd/4725f1_6352e9f56967491fa8649624ebc6f5ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_54a8aafbb542419fa5888ecb6c672759.pdf
    • https://static.usrfiles.com/ugd/c75f60_93b4783135dd44728913cf61292d6cae.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_off000071e1.bin
6b9ec89b67aff63ca2f6f8ff2bcbf8c1a62b23dab7ec7185c541feca0bd85e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E1 5052 bytes
font_01_sfnt_off00008319.bin
3bcb24f10b268005eddc909aa60be89d85a5a0a78462d0c1324b4d2f38fb2ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8319 10160 bytes

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