Malicious PDF — malware analysis report

Static analysis result for SHA-256 90de511b4269dd39…

MALICIOUS

PDF

48.4 KB Created: 2020-10-29 15:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 280c2de110a90b78419760a9ec2b941f SHA-1: b9ee038f87cad7d0f290914291f294d196f97198 SHA-256: 90de511b4269dd394e6f0b5c395f1c214d33031ca37e4ea234ca80034fa27016
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/aws?keyword=jack+lalanne%2527s+power+juicer+express. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest an attempt to lead users to harmful content.

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/aws?keyword=jack+lalanne%2527s+power+juicer+express In PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/578622.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/ximil_jizeb_kobimatoja_legiveko.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/meduxabezewor.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/66e6c690b19c4d2.pdfIn PDF document text
    • https://nimewoguvinu.weebly.com/uploads/1/3/4/4/134433183/wivasimetujiw.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/73405fc.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/fosagobomap/headway_beginner_student_s_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88caf8b1-1f86-4042-b5bd-0ceba2e656ec/nazibazuligagos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efff6f5-32a9-4906-bb7e-6796d6306b4a/midewog.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/bangla_adarshalipi_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/html_file_to_converter_online_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1281dfdb-1945-404d-add6-766201ae8fd4/kufavelixibizudipavidez.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/libert_1_ngritude_et_humanisme.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6630 5248 bytes
SHA-256: bec88bb3a79574f1ab2a4396eb6b749ddb9728d9b3f89b7671007cdd27288c04
font_01_sfnt_off0000783e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783E 11272 bytes
SHA-256: ea9f29d8b8cdb8249072f1b87fa9d950a8e53b43a937c6bd887e1400fac4a671
font_02_sfnt_off00009ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC3 16204 bytes
SHA-256: 73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502

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