Malicious PDF — malware analysis report

Static analysis result for SHA-256 d575169735994268…

MALICIOUS

PDF

46.4 KB Created: 2020-08-16 17:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de45dc81da21c679faf0741d6ceb1e66 SHA-1: dcefc0b32d1f744533757d0e6730cf8cbf7fe2ab SHA-256: d575169735994268fa5f265dc7708da6b68efc876ddee65da18d0911c0c62852
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.ru/pify?keyword=amma+thalle+song+lyrics', is designed to redirect users to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, some of which point to potentially benign content on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for a 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/pify?keyword=amma+thalle+song+lyrics
    • http://files.selbyvillepetandgarden.com/uploads/1/3/0/8/130813055/3436fe13d8aa0.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/differential_calculus_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/2010_volkswagen_golf_turbo_diesel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3032/2071/files/50707534232.pdf
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/59047654053.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/60075808946.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/autonomous_desk_manual.pdf
    • https://cdn.shopify.com/s/files/1/0444/4851/4215/files/cayley_hamilton_theorem_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/15771160660.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/80797493674.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_off00006844.bin
fd051b1c658eec8ed8628230679e532ec6e736501f78f2db06ce13f4dd0a12f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6844 5304 bytes
font_01_sfnt_off00007a29.bin
a65bf055678ab74f240e142feab52b4679cbf270c3865704c42f1c1570e0ab6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 16576 bytes