Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b953ace829cca70…

MALICIOUS

PDF

46.2 KB Created: 2020-08-24 15:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca4f13be9ce7a1bbf795e0f578c7fec SHA-1: 18f60b85ff52388be7e41066342e4d2df5ed7fe8 SHA-256: 3b953ace829cca7064a62067bee376cd1647c02e140dcfd3b4ac942ce0cff3a1
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=caduceo+medico+pdf`. This link is embedded within the document body, suggesting an attempt to trick the user into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=caduceo+medico+pdf
    • http://files.septictankpumpinggwinett.com/uploads/1/3/0/7/130738622/e6631b4bc964d8.pdf
    • http://files.themercylist.com/uploads/1/3/2/3/132302876/1ee656cd97cd7c.pdf
    • https://cdn.shopify.com/s/files/1/0437/7804/8162/files/resumen_de_alcanos_alquenos_y_alquinos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/furitevixirobexuwatido.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/99584235774.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/jirumupavemitesen.pdf
    • https://cdn.shopify.com/s/files/1/0432/1722/3840/files/25908902432.pdf
    • https://cdn.shopify.com/s/files/1/0464/6676/0856/files/29227824842.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/sojapiwaxapajozen.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/fundamentals_of_acoustics.pdf
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/ascanio_in_alba_mozart.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0534/files/28313192564.pdf
    • https://cdn.shopify.com/s/files/1/0433/4898/3959/files/xanekobalifomudagut.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_off000077ba.bin
8e4be65f4f4b23d9ae94ca0808e98317fb512d26654a6b89901ca021f13955e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x77BA 4900 bytes
font_01_sfnt_off0000885a.bin
15ba331d71aa4cc53138a5d9d9710c08480576a7b955d06a4c84f83bbe5e726a
pdf-font-stream PDF embedded font (sfnt) at offset 0x885A 11180 bytes