Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3b28bae6c17b7b…

MALICIOUS

PDF

51.1 KB Created: 2020-10-28 22:36:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 219b50d56b6febb55dfa7a4edd0f8c1b SHA-1: 7d502405b296c0965349d9a3b61866b55ffff7d2 SHA-256: ff3b28bae6c17b7bc81a9e33712abf3746720cde21da007375af371520405bf9
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to https://cctraff.ru/aws?keyword=eric+carle+books+list. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure indicates embedded URLs that are likely part of a malicious redirection chain, aiming to deliver a secondary payload or phish the user.

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://cctraff.ru/aws?keyword=eric+carle+books+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375696/normal_5f927428b15b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f8751196c3d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f91d23275ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5f998bc943dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5f948f13bb023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f992906389d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f9629dc5a3be.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/geradi/wufajutasunemupumur.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/somibugipupuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/mozojazega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350a28c0-7eed-4570-9948-a21e666bead1/28345274848.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/faxazoli.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/75053075626.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/crossfit_bodyweight_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fe7136-dc33-4e88-ad9f-c3c4bc8e42c4/sadlier_vocabulary_workshop_enriched_edition_level_g_unit_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/nisavesutiwalofuxug.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/32780047036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f29c0a3-a169-4331-a029-69b745423bd1/45733179365.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/pawakewifetapawagogosep.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/58111682108.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/xanajejejazewebatak.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/wodunanewaberoseror.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/85410477737.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_off00007ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC5 4012 bytes
SHA-256: d755bf75a12c26f0271c09c4a4efaef897f29302ef64ba4eebab0dd3be5a5a14
font_01_sfnt_off000088fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88FC 4952 bytes
SHA-256: 9332a7c92020e84a3441f33f3e0abd6fb60012073f18fa4df3519e998e6d307d
font_02_sfnt_off000099e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99E4 10684 bytes
SHA-256: 7fccac71948ce71bf51f500e2df70bd19b5f15e76efa5c847d48a5c829c54748

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