Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7bd7181c652947…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 20:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284d2901bdd09e4db73de1ce1da65617 SHA-1: a4f53b74ff2f7a541428136cafaa6d63696bc113 SHA-256: ef7bd7181c652947bc125db108c1559f2200d48e94db357cf5229f364acbc2b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=como+se+usa+el+titan+gel'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/b8c837_6704fc8c461243eba8664ef5b6db5616.pdf' being the first identified. The document body, though partially corrupted, includes the same malicious URL and a reference to wkhtmltopdf, suggesting it was generated programmatically to host these links. The primary attack pattern involves luring users to malicious infrastructure through a deceptive document.

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=como+se+usa+el+titan+gel
    • https://static.usrfiles.com/ugd/b8c837_6704fc8c461243eba8664ef5b6db5616.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cdb6847933b43199d51d19747e5f3ae.pdf
    • https://static.usrfiles.com/ugd/bb13a2_ae8c24670a3a48299510df73a3a19198.pdf
    • https://static.usrfiles.com/ugd/08fe48_284bc851cc824412bb929083e529b874.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdc77f2aa0844d95be48d2cfbe874bbd.pdf
    • https://static.usrfiles.com/ugd/353d00_f8f20307778a462baee8464689c436de.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa3f79f315344e1b9542d8b04c15f966.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0d5f7d0a2804338a71893bb3db4d2d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_00019555e78f499daa8fb10badac18db.pdf
    • https://cdn.shopify.com/s/files/1/0460/6728/6180/files/sex_coloring_book_app.pdf
    • https://cdn.shopify.com/s/files/1/0465/0840/8982/files/lapivonuxujanimives.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4699/files/72984643530.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/guzupogenamuvax.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_off00006ad2.bin
36693a72865edf2fa8750c98fd691e23a86c5a8fc098cf1f4c2aaa1a90810b37
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD2 4816 bytes
font_01_sfnt_off00007b1f.bin
892bb8aea65055e03e9d0a742ceade24a3e4b969114c7dc8dc549b2d67c07352
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1F 11072 bytes