Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf6aa7f751b2553…

MALICIOUS

PDF

45.5 KB Created: 2020-10-30 16:54:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d212f1063cc2352812ffd1bb37d2a1a2 SHA-1: 836ca34e004b3d08fd0d8703fa1d4308c34aadf5 SHA-256: 9cf6aa7f751b2553da909b7ba983dfdaea4941afe79dfbf2ff51a13b726636e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/123?keyword=batman+the+dark+knight+interrogation+scene+script. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is https://uploads.strikinglycdn.com/files/952baa2f-f4ab-408c-acb5-bb9aa739ce10/vutokiz.pdf. These elements suggest the document is designed to direct users to malicious sites, potentially as part of a phishing or SEO-based attack.

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.com/123?keyword=batman+the+dark+knight+interrogation+scene+script In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f88074ae70d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f9103f1d1c0a.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/952baa2f-f4ab-408c-acb5-bb9aa739ce10/vutokiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/75130876477.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/allegra_pediatrico_bula_anvisa.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/bestway_cement_annual_report_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0030/5082/files/android_browsers_that_support_flash_player.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/las_brujas_no_se_quejan_libro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6102/4185/files/18538862338.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/waterproof_pillow_protector.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_off000073b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B8 5568 bytes
SHA-256: 93ee8595af560ca50a2e91d9353355043005e4d5de8235eef5f9bb6c45b00c22
font_01_sfnt_off00008683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8683 10120 bytes
SHA-256: a5c0f8f750b54f40fd157fa1d14f0670ec831afbf11466a0220015129b1941b8

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