Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f96128c7886ec87…

MALICIOUS

PDF

40.7 KB Created: 2020-08-19 13:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a89c7c1e23f65b91e3d349d990907f9 SHA-1: ea90b1af753f496cacc58d679e5a3cf8dc91cc42 SHA-256: 6f96128c7886ec87b28c3f23d4a9c2ad0697e69282f9769e558fc9ecb4d8e19c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://ttraff.cc/pify?keyword=cabac+cable+ties+pdf'. This suggests the document is designed to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links indicates a social engineering or redirection attempt.

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.cc/pify?keyword=cabac+cable+ties+pdf
    • http://files.rapdp.com/uploads/1/3/1/6/131606331/gusawasizerodagazike.pdf
    • http://files.preciousmomentslivebymichelle.com/uploads/1/3/0/9/130968985/9796818.pdf
    • http://xufiz.prostatecancerburnaby.org/uploads/1/3/0/8/130814124/1499663.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/mafujiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4416/6037/files/butenobaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/95717509988.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/98229770395.pdf
    • https://cdn.shopify.com/s/files/1/0437/4947/4453/files/4d_printing_technology.pdf
    • https://cdn.shopify.com/s/files/1/0435/9841/3987/files/jitterbug_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/cambridge_advanced_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/ravixagomiwiwimofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/75839092925.pdf
    • https://cdn.shopify.com/s/files/1/0433/5452/1758/files/enlightenment_now_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/1070/1981/files/tejumelotoxewodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/bulletin_de_salaire_vierge_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006213.bin
1a9a1aa88c6cd471c4dd4d199b478fdb8bbf4f0370571235229d1b070e249763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6213 5096 bytes
font_01_sfnt_off00007373.bin
8aa1c9d64a5a1e57c0821e8d8d9285249ee8da7db4d9733e8102a507b4d7d036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 10088 bytes

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