Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a2c615a295a825…

MALICIOUS

PDF

36.6 KB Created: 2020-08-12 08:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d04a41524855234fd01d9c83efa7d7 SHA-1: e87ca233fed1728d79c82a49fa71f422e80c63f9 SHA-256: d9a2c615a295a825bcb1374db1304b4856879c8ec89bb082cc887b0c156043c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wb?keyword=acr%20contrast%20manual, which is likely intended to redirect the user to a malicious site. The presence of numerous PDF links suggests a link farm or a method to distribute malicious content through seemingly benign PDF files.

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/wb?keyword=acr%20contrast%20manual
    • http://files.wharfemporium.co.uk/uploads/1/3/1/3/131379099/1536558.pdf
    • http://files.dancingtheland.com/uploads/1/3/1/3/131379680/jaxasilusuvigi_zimuweturekuw.pdf
    • http://files.evolverwellness.com/uploads/1/3/1/6/131606035/8590297.pdf
    • http://files.olopsj.org/uploads/1/3/2/6/132695531/lesarawoge_segumapaf_dogawugivigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/73821965281.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/sepabexezereguselij.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/master_editor_annotation.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/rivibubebamikoxetibidug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/85891590917.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/mixorinoduvimubefafuju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/4555047688.pdf
    • https://cdn.shopify.com/s/files/1/0432/6529/4504/files/infrastructure_as_code_github.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046eb.bin
a0a388c04e71bdf3805b1bc528971072033adda54a95bce755b7e0f499c34833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46EB 4648 bytes
font_01_sfnt_off00005682.bin
d2a8f5edb4040e722e6a4b7dc56b40628ef600383d80f68793386dbba92075d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5682 9688 bytes
font_02_sfnt_off000077ba.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BA 4324 bytes

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