Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de2a8b01da7c291…

MALICIOUS

PDF

51.8 KB Created: 2020-10-15 04:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 10513fd99149181391de067376c4009f SHA-1: f991b48429c9cfc48711c14fb58d55dab416fcf2 SHA-256: 3de2a8b01da7c291a0214fb84c6041567774282b38056fed7bc8d067ec6524ab
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector at 'https://cctraff.ru/strik?keyword=manual+de+cultivo+de+tomate+en+macetas'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking through to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=manual+de+cultivo+de+tomate+en+macetas In PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/kazomelivum-koboro-kefodaluwewafag-poded.pdfIn PDF document text
    • https://zidabowejixu.weebly.com/uploads/1/3/1/1/131163559/7446280d.pdfIn PDF document text
    • https://wepeweguwerixum.weebly.com/uploads/1/3/1/8/131856135/tibadotazamixixepe.pdfIn PDF document text
    • https://site-1038323.mozfiles.com/files/1038323/73198229617.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/9635349.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/f71a1c6.pdfIn PDF document text
    • https://site-1043925.mozfiles.com/files/1043925/mezilidetibulegule.pdfIn PDF document text
    • https://site-1042920.mozfiles.com/files/1042920/10950966985.pdfIn PDF document text
    • https://site-1037868.mozfiles.com/files/1037868/robebupiga.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/759977.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://site-1043803.mozfiles.com/files/1043803/8857292742.pdfIn PDF document text
    • https://site-1038967.mozfiles.com/files/1038967/tajegosakobi.pdfIn PDF document text
    • https://site-1039998.mozfiles.com/files/1039998/rolamaketakipexanefax.pdfIn PDF document text
    • https://site-1038586.mozfiles.com/files/1038586/52996304289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00008c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C25 5052 bytes
SHA-256: 1f0e83a291a1c6e5fbc58a2041a8ef1be88b3d5a5e092f336b52b8d09a856e17
font_01_sfnt_off00009d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D45 11268 bytes
SHA-256: 76ac3298e84fddeb794be4d6f600e74ea55351de0726a45194bfb64ea12cd487

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