Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e12ad0eebcb0ed…

MALICIOUS

PDF

40.9 KB Created: 2020-11-04 07:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 24a3f2c9340ba4ec207457301c541eb9 SHA-1: 1db0a56bae649897b7c5046bc9d15afec0457e47 SHA-256: b7e12ad0eebcb0ed1dda3df7e29e4593a3f77cc26154e1c89cb46e6024935bd9
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the URL which is likely intended to lure the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL suggests a phishing or redirection attempt.

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/aws?keyword=algebra+with+pizzazz+answer+key+page+166 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f8895bce193b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f9995aa9329d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03b9122-eae9-4594-a7ad-1a3f2b4928a8/52625530442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c622fe1c-c1df-4c23-958f-8c63cc7e46db/46860997574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf548f3d-dded-47b3-b1c8-e884bcde1269/2837349953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796bec84-42a6-472b-af7e-4b1087b83a20/el_padre_nuestro_oracion_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/skull_base_foramina_mnemonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9213ae01-1524-4de4-9967-f98772eef127/89712379064.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/pudasag.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/netajopazogexes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d111ce1-d28c-48c8-978d-9174c03a4def/prueba_de_fermentacion_de_glucosa_positiva.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/76552340865.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/45319823992.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/bronte_jane_eyre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1acaebb8-cfa5-4b6e-9a04-7341b362fadc/wezuvewin.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/resuvimejaxukip.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_off00005e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3B 5724 bytes
SHA-256: 153692c329117ed803257f5cdec6564267d4038df8b1e076379a5de480400756
font_01_sfnt_off000071dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 10676 bytes
SHA-256: 8e11d47204137b5d6c1628048564854bc423ed4b7a641b4b4520a374ad47ee3e

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