Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3e34b85a8349af…

MALICIOUS

PDF

37.2 KB Created: 2020-08-29 01:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6728bee16db0ebbb77616ad8afa35db SHA-1: 461eafb6a87a8e68ec3b8ba62561f38c83e2d1b8 SHA-256: 6b3e34b85a8349af079534ec11104b40a22008ef9d0416a9efd053a4c594180c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.me/wix?keyword=present+perfect+continuous+tense+act. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.me/wix?keyword=present+perfect+continuous+tense+act
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_aadb38ffb99442bab22c92120aec1acd.pdf
    • https://static.usrfiles.com/ugd/b8c837_184f284dc41c41738d9cb2833859b8bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0364a0c79614c7c8e994394df21ac15.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ae4956e8f64808af31c29f675bcc92.pdf
    • https://cdn.shopify.com/s/files/1/0463/1029/3669/files/tegidubusifesakonotusanun.pdf
    • https://cdn.shopify.com/s/files/1/0439/2094/9416/files/migugokikedozazera.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9900ea248a4ee1b9f7bee44bbebd19.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3b6c19ec5842778bde5634da6edbf4.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_off00005601.bin
2b5dadecbd1f4011438ae070149a5038036c471c3ecbbf6746b071bd904d2ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5601 4980 bytes
font_01_sfnt_off000066f2.bin
a77d77b34a89db050d2b2a93dd14070928d0c543bf8c9fd34a58825fedfcd5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F2 9808 bytes

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