Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6f9a2a9f8b7147…

MALICIOUS

PDF

56.6 KB Created: 2020-08-29 23:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20855a742cae4478c649425097c68bce SHA-1: f3d68675d9c34a35fee0efb829df3d1f510011c2 SHA-256: 5c6f9a2a9f8b71470942eca028b5504fcbbca800fa91a5442d9cfa8f87f69ea2
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.cc/wix?keyword=big+sean+no+more+interviews+instrume'. Additionally, PDF_SEO_LINK_FARM indicates a large number of external PDF links, with 'https://cdn.shopify.com/s/files/1/0431/5689/7947/files/kududeloxonokigagurewisa.pdf' being the first. The ML classifier also flagged this PDF with high confidence. These indicators suggest the document is designed to redirect users to malicious sites or host further malicious content, likely delivered as a spearphishing attachment.

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/wix?keyword=big+sean+no+more+interviews+instrume
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/kududeloxonokigagurewisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/66266059821.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/whistleblower_complaint_inspector_general_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/ridep.pdf
    • https://cdn.shopify.com/s/files/1/0445/9646/1732/files/vitalsource_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/71517927629.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/19964272650.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/68796333847.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/sekikaxalanabivos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/nike_advertising_strategy.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9acc0b0a0f4400c95413b4d3c671cf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_270b0f77fe8f404788e6dad65ddc8bec.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/pdf_bookmarks_from_word_table_of_contents.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/narusavesajujosepojofiduf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1094/0328/files/complete_divine_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/54905505943.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008516.bin
cb5024fc4a4f976fb3d4fadf116233e2bf891a43e88dd1c6d2f857d8ad0b55c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8516 5172 bytes
font_01_sfnt_off000096a2.bin
3f22bc5b551a79e6debcfa6c8dbf429e0496cef3c0723b4729fa9c76ce99d0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A2 3220 bytes
font_02_sfnt_off0000a403.bin
ddba9810f7005dbfe5c3452d07d3e3bf03e97b49686302f8771461edcb1ebf95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA403 15212 bytes

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