Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1d77f1d1697d0e…

MALICIOUS

PDF

44.6 KB Created: 2020-11-04 08:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 54789023f0a87775e4ceed7da1b35af1 SHA-1: 89766de9db2f7149440edea740118d38607b67c6 SHA-256: bb1d77f1d1697d0ebb8d6789259b219204cca39d6244bdd16c143b141065c0bf
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 known malicious redirector infrastructure, indicating an attempt to lure the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded link suggests a phishing or redirection attack, likely delivered as a spearphishing attachment.

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=it+s+not+okay+att In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8b12d5182a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5f974201367bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_5f97837a66a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f8d276357778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f8a0b357d8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f955538c2e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8a47267d5a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f8a755faa29e.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://s3.amazonaws.com/rupatojuko/vertex_form_quadratic_function_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/lalowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bceb12-f9d4-4ef5-aa9c-dbd80b07f8dc/36103860055.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/mets_group_sales.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/52732916867.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/watch_madea_family_reunion_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/26380944357.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_off00006643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6643 4276 bytes
SHA-256: 6ca88cb0868ec7de5f8c4aceb873a0085b5f2ef8cd67735b2ed93911b1fb9326
font_01_sfnt_off000074c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C0 10312 bytes
SHA-256: 722b4daccd811caf2f7f68ae19fc796d251b2778ce57796d41f28387d7be5ba1
font_02_sfnt_off00009804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9804 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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