Malicious PDF — malware analysis report

Static analysis result for SHA-256 8417c2538b9064b5…

MALICIOUS

PDF

55.4 KB Created: 2020-08-30 04:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ce21dd3fc9cbe9f7e713c7e840c411 SHA-1: ed199d755f716d8368cac6c8ad2a934b08e5194d SHA-256: 8417c2538b9064b50db10d05d02bfce77eb013eaf4267ffc0c0a0658d956e6a9
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, including one pointing to a known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded links and the overall structure suggest this file is part of a phishing or SEO spam campaign.

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.link/wix?keyword=astm+a228+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_94654a8b021846d6a31af0396024b847.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b2801f4ef954e06afde1a49b0f6e3d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_d05ce806e25141aa92bb4a89de07d8ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd62621291dc409eac03e07dfa4e7aec.pdf
    • https://static.usrfiles.com/ugd/7f46b5_34076d7a67054e31acaf17a2ce4edd89.pdf
    • https://static.usrfiles.com/ugd/20d83a_6e7411e184094bd3837fab36796869b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_41dbeb698bd24e83b59ff60dc4f5f003.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a65298334da4510b6ed68a339334389.pdf
    • https://static.usrfiles.com/ugd/d5cf39_529763650a434a2bab6f23d12f54bd10.pdf
    • https://static.usrfiles.com/ugd/bae363_4a5313f5f79549beaded4bf4fc8425a9.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/fedimetutupoduzojodumomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3636/9318/files/67901361271.pdf
    • https://static.usrfiles.com/ugd/227d0f_e9fe030ab0454305a4a6e5a8cb4b3f5f.pdf
    • https://static.usrfiles.com/ugd/5438e3_fe6e9327d96042b7aa71870beb2e7f20.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7a06a31749b4e9e8983b609aa762230.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_off000059ad.bin
813770da85d7fb8cde66bec0cb1ccec7fee336681f3d0aa5a9f6c9f121b26472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AD 20176 bytes
font_01_sfnt_off0000996d.bin
6023eaa31f7dc40c52fd0eae744435119210b118434b8291487abf6848dc5e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x996D 5376 bytes
font_02_sfnt_off0000aba0.bin
342edf2da0a57f10a6a796f95a654fadb598b20c39aa52e1a058ce9ffc18a5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABA0 10516 bytes

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