Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3b9d3774438406…

MALICIOUS

PDF

42.4 KB Created: 2020-11-04 13:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da8c2bd25a8018a04aeb44b332801d22 SHA-1: d2fbcb941b7581f485782c94491ad91bee47e658 SHA-256: cd3b9d377443840684c65a72bd754c819743a509af53d1d02c990ab6e92ba70e
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://gettraff.ru/123?keyword=video+downloader+app+for+amazon+tablet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f95d17271bcb.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/pazifetanegapu/3567807145.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/wudawabisewiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c363a7-9f3c-4ac3-a9ef-bb41c9807a3c/grade_8_math_makes_sense_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/letters_made_from_pictures_of_objects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683d40c2-4ebd-4128-80ff-924e08aee423/72134918565.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/calendario_escolar_2019-_20_sep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea51ad7-8c31-471f-a3db-52ab4c250fe3/rebekikopatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe4f935-ed95-48e7-8ad5-271c1ad281fd/20993552405.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/assoreamento_de_rios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7590a32c-1bf3-42de-9287-491bc238bc3b/hidruro_de_cromo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126c588b-653f-4ea2-80b9-37c90200284b/jipoxukedim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291ef9c9-48b1-4cb0-92d1-bcb0712c6262/netepafudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95acd7e3-3c5f-4d98-a65d-845d264fb2e1/83406798018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576d47ad-632f-40f3-b242-f2ef67e30f6b/sufumibat.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_off0000668f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668F 5256 bytes
SHA-256: e346053236dfcde9288e30b05d9d9dcdefb086af2d30e7c34c544fc939834e51
font_01_sfnt_off00007875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7875 10792 bytes
SHA-256: 44116b3b144f7d530963255693e3f1ee7b5e2bdb13dd3b0a10e1f5d6e27cfba5

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