Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ba1241969e6f78…

MALICIOUS

PDF

40.2 KB Created: 2020-10-28 01:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ce6ee36d9fd94189044cd7d665bf1ed9 SHA-1: da1dbaa150ba3a4db7ad96d95bfd4ac6b178eb91 SHA-256: 64ba1241969e6f78161ee60c1f3c3dc528bf671e603e697791424a9db275933e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. This suggests a phishing or SEO poisoning attack aimed at directing users to malicious infrastructure.

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://cctraff.ru/strik?keyword=how+to+add+page+on+google+docs+mobile In PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/pokom-fejawufenali-vagisudupenof-nexedi.pdfIn PDF document text
    • https://kalodobig.weebly.com/uploads/1/3/4/4/134432105/60a5c80e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5f8d7dfbe87a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f98affd05921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5f8a0582cd811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f918add1deb9.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/jamokaroxoj/lefexoforelusisesopozowev.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/gewedufivisusuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/genetics_practice_problems_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/62638060449.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/jasumedebasofakinewexug.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/adsorption_process_in_wastewater_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7247b818-8826-4056-95fe-2c80a863309c/bapupegasibib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d53c30-f38e-489e-b150-480445d1ae84/jopivazitopal.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_off00005d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 5492 bytes
SHA-256: 64908306b5786d2ba24e357d6474c6c9cfd7ea2044ec60090c5d5e7e34e735a8
font_01_sfnt_off00007029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7029 10452 bytes
SHA-256: fb0d022f025033215fa1d0bca5e1f68e3f54582f110c4c40a17075095b01b51e

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