Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f01e245838ed51…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 04:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 421961b244477784acd1388750077193 SHA-1: b932a759c4fb7b5f3af8639017ecc358d1f140d8 SHA-256: 03f01e245838ed51a00ccb70ec235b3365eb0a83a0b3aa1b684fa2068013d3ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the primary links, 'https://ttraff.cc/wix?keyword=minnesota+registry+of+nursing+assist', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=minnesota+registry+of+nursing+assist
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/79e5df_fe2a0031d2ea4dc191e254343a00c95e.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7d5c5353c0e4a96b9988c8d83e179ac.pdf
    • https://static.usrfiles.com/ugd/4c1554_f83988a525c647978e8de90331e63468.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/bamukukaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/bokashi_balls.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/17085574317.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/15271091188.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/35233366290.pdf
    • https://cdn.shopify.com/s/files/1/0464/2317/9416/files/gitupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5452/files/inventory_count_sheet_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/jinisikiduwarusitija.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_off000061ef.bin
641eeab451a57b0bb78e86461441cefcfd4c99547bfcabe8a24269dbebd79c20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5012 bytes
font_01_sfnt_off0000731b.bin
993467d65307e06b3bbbaf5d9fb77cc12491dcace821acd7212a9c7ed5df5488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731B 10844 bytes

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