Malicious PDF — malware analysis report

Static analysis result for SHA-256 8124d34d7260a9c5…

MALICIOUS

PDF

59.0 KB Created: 2020-10-26 09:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b5c1e338cf53ad0ae58ff901b5a3dd SHA-1: 9d172c8e2b50397b70388d6428468a594fed2ce4 SHA-256: 8124d34d7260a9c57fd65d48e66e21b1a4d6b76f03d431450adfc776503bb635
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 one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or phishing attempt, aiming to direct users to external sites. No scripts were extracted, but the presence of numerous links suggests an attempt to drive traffic to malicious infrastructure.

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/123?keyword=carcinoid+syndrome+treatment+guidelines
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/8471045.pdf
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/vibuxejelale.pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/bab531a7.pdf
    • https://cdn-cms.f-static.net/uploads/4419225/normal_5f9629f08ee5c.pdf
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f86fa489f1c6.pdf
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f8a7bc07a8ac.pdf
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8b3c9208189.pdf
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f91f02988721.pdf
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f9615558d4a1.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f880fe328f55.pdf
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5f9180f48d411.pdf
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5f966e6037074.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f919fbf1f0ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0c9cf3fb-4abd-4f0e-ac6c-1a4729fda33c/16876777133.pdf
    • https://uploads.strikinglycdn.com/files/c9ee5418-230d-4019-b33d-075257802927/13698578599.pdf
    • https://uploads.strikinglycdn.com/files/278ac1e3-ed9c-43de-9c72-5e2772802db7/18447282657.pdf
    • https://uploads.strikinglycdn.com/files/a639c225-c402-4b07-a204-8963edb9d32f/fogukaju.pdf
    • https://s3.amazonaws.com/pesetufavo/85810688465.pdf
    • https://s3.amazonaws.com/wekibik/adobe_acrobat_reader_viewer_editor_creator_app_download.pdf
    • https://s3.amazonaws.com/bepukuba/fegunatixakegomarizu.pdf
    • https://uploads.strikinglycdn.com/files/9ea85bf7-4289-4c71-b25c-7cb5d02fab74/24150594082.pdf
    • https://uploads.strikinglycdn.com/files/968f27b5-54b5-404d-99f6-ce04f362f28b/22415335446.pdf
    • https://uploads.strikinglycdn.com/files/e5cf43b4-eae9-4eff-8f5b-da1ab3975b30/9558696017.pdf
    • https://uploads.strikinglycdn.com/files/191b57a0-08f6-472f-b11d-78b2d44cea7f/18678843641.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_off0000a739.bin
11c2665c8e13b47d10baec1fde726574e998bf9a47be5ca1549bd8a2289e7647
pdf-font-stream PDF embedded font (sfnt) at offset 0xA739 5268 bytes
font_01_sfnt_off0000b90c.bin
383bc8a8c00f6df6dd1000296991ee3e88903d939665bdcf56a8ba9ba5bd7bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB90C 11376 bytes