Malicious PDF — malware analysis report

Static analysis result for SHA-256 da15bf85ef5f2a02…

MALICIOUS

PDF

31.5 KB Created: 2020-11-02 15:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 51d02b5f19340d30cf203f8c88d6809b SHA-1: 262a4bfd89d0433c2b2e4933fc47ac82436cde4c SHA-256: da15bf85ef5f2a02fd466a599bb6dc326c28fcf8d3f14a9f56ac4ea0d3ae90bd
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ggtraff.ru/strik?keyword=wordly+wise+book+5+lesson+16+answers'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the redirector suggest an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ggtraff.ru/strik?keyword=wordly+wise+book+5+lesson+16+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5f9dccb4cf749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f9553f95d236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f9d3cb4742bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_5f8d6a0c69ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f9eb42d0b270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0786/7583/files/global_entry_kiosk_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2769/3227/files/xaroluralizemot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9074/8595/files/manual_handling_equipment_australia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7350/9793/files/heros_quest_07.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4170/4104/files/30365271498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7952/7321/files/56757040637.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x415C 5560 bytes
SHA-256: 55708a8e9c668390399d4264ae3a7f813bc1f28eca14dad3f796e11074d47e4f
font_01_sfnt_off0000547f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x547F 8524 bytes
SHA-256: cb890b11c9d39d99f3c2c1c2304c897c17d1d83fe07216a3ff9d241400145882