Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9145d506fbe24a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-29 13:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a5033992744ff9002bef0f5a8a5c47 SHA-1: d017784f579dcbd837a5b199170b392ba18ce49e SHA-256: 5a9145d506fbe24ad6bab5f54d2b38db360549e5ab7be78e11e5028abb1ed408
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=plant+cell+worksheet', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely to direct users to harmful content or further stages of an attack.

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=plant+cell+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_d67cc1a50274440aa9e2f9275bacda63.pdf
    • https://static.usrfiles.com/ugd/856cea_f8c2c069769341de80480ea8f5f19d9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca538b96944b4834a61426501ab22af1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5e07f0d016147b8b28ddc512b72ef60.pdf
    • https://static.usrfiles.com/ugd/b8c837_efee563323c540958834e6aa0a4aee3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f8ae930d722489f853e281d9c3867c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a79300031340454fa1555e5f191688e0.pdf
    • https://cdn.shopify.com/s/files/1/0436/8665/8213/files/equilid_50mg.pdf
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/how_to_download_all_photos_from_photobucket.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/28303956989.pdf
    • https://cdn.shopify.com/s/files/1/0432/9141/0596/files/introduction_of_sql.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cbd.bin
f8248a08b544bba210d30bb76fa387c782ecf14367bbb707aac0ca1d8e5bdec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBD 4784 bytes
font_01_sfnt_off00006cf6.bin
98595fca7d5219729876db0dbc8858d3c873ba1b424cbea4189e756f2146f56e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF6 10364 bytes
font_02_sfnt_off00009077.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9077 4324 bytes