Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a15cef2573a92ce…

MALICIOUS

PDF

40.3 KB Created: 2020-08-22 13:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d70494a76c5f035a759ecfbb474ac1c SHA-1: 71615e5a0e3de12eb99cb27080c8b1bedf276877 SHA-256: 4a15cef2573a92cee4cc559622b6504cccf0ea9f2529db20e4f8975ceb91bbf3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=beyond+laser+software+free'. This URL is likely intended to lead the user to a malicious site. The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=beyond+laser+software+free
    • http://files.lillianandlucija.com/uploads/1/3/0/7/130739387/1333153.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/zopagen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7607/files/centroid_and_moment_of_inertia_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/mubepufasovaxarudagemola.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/acc_aha_lipid_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/2362/9477/files/vatitilimemijovewogile.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0732/files/78286960357.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/rufafoxobijilegapole.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4290/files/17902520529.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/bowedatovivapilis.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1418/files/couper_un_en_deux_mac.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a6.bin
313d57a17c869a0ab383d82bcb792967917790d68a6789ae3c773f8682592ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A6 5144 bytes
font_01_sfnt_off0000744d.bin
5e8a4a302d86c5b9e84078ba2ab958b55eef9393c693dd24814e6d799e5569e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x744D 9440 bytes