Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec872f5622d1ea2…

MALICIOUS

PDF

41.0 KB Created: 2020-08-20 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fcca53239a5328cb9ae9091c8616ccf SHA-1: 1e81758255dc6fca82de75b1a6d255f066af7bdf SHA-256: 2ec872f5622d1ea27109fb2ac5aeb0da09786cd58be7a384ddea46d1e6fa20ca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded external links, with a critical heuristic firing indicating a link farm designed to redirect users. One of these links, 'https://ttraff.com/pify?keyword=ok+in+formal+writing', points to known malicious redirector infrastructure. The document body itself is largely obfuscated but contains the same URL, suggesting the primary purpose is to lure users to malicious sites.

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.com/pify?keyword=ok+in+formal+writing
    • http://popebu.aglandrealty.com/uploads/1/3/0/7/130775318/c92bf1c1558e.pdf
    • http://vepuwujil.fatzdomino.com/uploads/1/3/1/4/131482992/21b082.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/juxeveba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/make_your_own_report_cards.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/faa_aviation_weather_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/samolilolabukewelexoxutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5459/4213/files/enduring_movement_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/2960/1175/files/84518752596.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/tumor_de_la_cabeza_del_pancreas.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/8257343929.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_off00006419.bin
1d637c594db30c52d2ff10f4a455d5c2e0816a0ebcba0902751f8f951878239e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6419 5092 bytes
font_01_sfnt_off00007568.bin
ff36a3fcdc1061fcebd00e901775b7677c9961ced3821e1bff95dd9e7cfb77fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10088 bytes

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