Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b12cd54d333a4bf…

MALICIOUS

PDF

72.7 KB Created: 2020-12-08 08:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2fd304c9ac0d61229bfb6e00849dea10 SHA-1: 1680d2e2be1d5d4127a4646061d71f735671e354 SHA-256: 8b12cd54d333a4bf8080307808ad81e20285cc6aa509d391d05ea3c61f7027b6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?utm_term=uc+davis+colors'. The presence of numerous Weebly-hosted PDFs suggests a link farm designed to artificially inflate search engine rankings or distribute malware. While no scripts were extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/strik?utm_term=uc+davis+colors In PDF document text
    • https://pidakobanaxob.weebly.com/uploads/1/3/4/4/134463411/zuxaxuwubax.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/7540019.pdfIn PDF document text
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/3d0430b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f91be7be050f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378628/normal_5fa9d0a05ab9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fa7f54406973.pdfIn PDF document text
    • https://fatuzolawodazu.weebly.com/uploads/1/3/4/7/134730183/nanal-derexuwob-dolikunusek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5f9e9f49b91d6.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/gateme/marin.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/aurora_borealis_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/libewapifinod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d67e6d-eee6-454a-8b5f-15e521c3b58c/34714127359.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_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 4984 bytes
SHA-256: b1b94caafbdd458fc32abbbcc9bc5f61f15eea33158625874842e3341de00730
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 11156 bytes
SHA-256: c884723e30f437f71f4e16b5139880578c6eff1c6866bd39d4f019401b800b42

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