Malicious PDF — malware analysis report

Static analysis result for SHA-256 76518f6aa7185495…

MALICIOUS

PDF

35.7 KB Created: 2020-08-19 07:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc1c359f9b1826cee3a1a0cfba9ddb3 SHA-1: 29bd6bf75e102483c23eb260373f7ac7809de7c8 SHA-256: 76518f6aa71854951f079ed5f781d25917e3a029e02327b12295b2599d40c487
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically `https://ttraff.ru/pify?keyword=veggietales+the+best+christmas+gift+digital`. This URL is flagged as a malicious redirector, indicating an attempt to lead the user to a harmful site. The document body also contains numerous links to PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly flagged this PDF as malicious.

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=veggietales+the+best+christmas+gift+digital
    • http://files.imaginationplayhousesf.com/uploads/1/3/2/7/132740193/9073311.pdf
    • http://fedinem.newenergycreator.com/uploads/1/3/2/7/132710694/tomibadipixigomof.pdf
    • http://files.commonplaceliving.com/uploads/1/3/0/7/130739174/54641d350b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/antonio_machado_poemas.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/jadetusulatusapuliriroje.pdf
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/grade_9_applied_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/3199/3242/files/14549858784.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/musomapojidekixegetava.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/41307633175.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/24497816243.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/degek.pdf
    • https://cdn.shopify.com/s/files/1/0434/1691/2023/files/51945596163.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_off00004c72.bin
c32ec0d1c8c0cc0e790e3e520ebeb62758f3fda858cd6361236f2cb2af97608d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C72 5540 bytes
font_01_sfnt_off00005f1c.bin
c8ac45e7f299a2c1000e674b2f27d3da672df1dc00ad8959956d2824f2e5e952
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 10216 bytes