Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0c0e53910c5dc9…

MALICIOUS

PDF

38.9 KB Created: 2020-08-31 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea4483cd50d1a34bf2eb05c94b6d76a8 SHA-1: 811104f62e6904e91a0af8679c3d8182f2d42b44 SHA-256: 5f0c0e53910c5dc9147f6cc63358dcf43930616d7721f8d1f0480d4fcc34bf78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://ttraff.com/wix?keyword=horizon+900+elliptical'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=horizon+900+elliptical
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/7959/6187/files/all_short_form_and_full_form_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/41755378398.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/fijotanebubasuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/lesobedojipojaniki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/terobenivojanobefokugawu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/wobugopididarikevekibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/76443436417.pdf
    • https://cdn.shopify.com/s/files/1/0432/7918/8118/files/example_of_asyndeton.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/36605415592.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/26213062754.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/39257902158.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/plantronics_voyager_legend_voice_commands_not_working.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_b3276632fb2b4971b507ddfde41d6b2d.pdf
    • https://static.usrfiles.com/ugd/eda9ba_527c8f8b9bb448c888d731c67eef97b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d1b85accdbe477e82bbe4241a94c353.pdf
    • https://static.usrfiles.com/ugd/3fc21f_5380767951644bbd835034a9d1c3e0e8.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_off00004d96.bin
1abd8fbafff5c143703e0923e13134650bffcbb6e267764c3e901035ba54eb5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D96 4848 bytes
font_01_sfnt_off00005e12.bin
cf26756e54f6537b6c75365f3b49a019ba07af64245a745d3ee6728624f9a547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E12 10128 bytes
font_02_sfnt_off000080b8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B8 4324 bytes

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