Malicious PDF — malware analysis report

Static analysis result for SHA-256 00cf74638da47bdd…

MALICIOUS

PDF

41.8 KB Created: 2020-11-03 19:30:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5d291bae29fcef5fe1d934af326ca10c SHA-1: 398040b74c0afb86e250d412834939027ae95cad SHA-256: 00cf74638da47bdd81a211ceb102e749f50d3701eb13cee6ca34be10cc45751a
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://cctraff.ru/strik?keyword=analysis+worksheet+samples'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery.

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://cctraff.ru/strik?keyword=analysis+worksheet+samples In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372383/normal_5f89f25c3d5e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f8beb5fd25f4.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/2850776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f9d469ab2fc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f92b45d7a3af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/southern_live_oak_tree_tattoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ea4b24-585e-49d9-83ec-064f3e763891/physics_halliday_resnick.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/oxford_dictionary_english_to_hindi_file_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3132/6631/files/rose_guns_days_stage_play.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/saregudemidepifivesane.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/genetic_engineering_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/jekabonapevizetebijas.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_off000064f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 5308 bytes
SHA-256: c2cf18d42a4ab2b571837912c5b512636d64581e3dddcf95a026f416de5fbe7b
font_01_sfnt_off000076f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76F4 10612 bytes
SHA-256: 9bd81d25e142b9bba6fc62c2d26927a08ce722ebb8ed7552d5179f89a3c0d118