Malicious PDF — malware analysis report

Static analysis result for SHA-256 e753a510ca5aa708…

MALICIOUS

PDF

88.3 KB Created: 2020-11-01 02:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c74b3146136fa625c468406f1944505c SHA-1: 33996bf8625ff3af819ef33d0653859dc46d3d84 SHA-256: e753a510ca5aa708a19c9cfb07fdc151ec1bcdbd45c2bf7f51e04225d20020dd
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'Menlo park school district board meeting' and a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also 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 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://ttraff.link/123?keyword=menlo+park+school+district+board+meeting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5f8deefe964bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374685/normal_5f99c454bc812.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/e5f611.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6076/2050/files/boruviwurupizuzewimuf.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/greatest_common_factor_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/pubukumogafus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1759/1191/files/oxford_junior_english_translation_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/genetic_algorithm_in_soft_computing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b965b69b-4e0f-47f9-b558-358b07089f9e/elementery_organic_chemistry_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12501c9-509d-4433-b2bb-e4463f9a1871/niduxanuraz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7700/1902/files/xemine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0882/5256/files/cricut_explore_2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/funcion_del_nervio_facial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7261/3280/files/88104457807.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 5484 bytes
SHA-256: af51212e1d95b0aa74f5924b1dd18e8f68d9ff2cf6b7b3cc37a3ee34574ae488
font_01_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 11124 bytes
SHA-256: 3fc3e02b3e4887686039c2408daec578639110e300bac025c43a311b1719b9ea
font_02_sfnt_off000145c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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