Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5478319e2d0e2b…

MALICIOUS

PDF

43.2 KB Created: 2020-09-05 21:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7bc59bfd3431ca81865df0f890497dc SHA-1: 2142edbce9bf2c151fb125fcd86dafa8b55d80d1 SHA-256: cb5478319e2d0e2be71ecf06025c35d94e9f34411b53bb14e45a366a80344412
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, which is further supported by the presence of the URL in the document body. The document also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external resources. The primary malicious URL is disguised as a commercial real estate listing presentation template, indicating a social engineering lure.

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.club/wix?keyword=commercial+real+estate+listing+presentation+template
    • https://cdn.shopify.com/s/files/1/0432/3698/2952/files/kebetumajutepex.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/dawigejofazuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/actos_de_habla_john_searle.pdf
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/ziduluguwewegediwigofijet.pdf
    • https://static.usrfiles.com/ugd/607883_42596efc50d74cf8ad8ed6ad0f236e1f.pdf
    • https://static.usrfiles.com/ugd/98e298_c9cd167c686940e79a537a8cda37b44a.pdf
    • https://static.usrfiles.com/ugd/1df9ea_ec75f7ac3f23463dae018ca3a59d4130.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_cd639b52455442b6ba88a8ef1995a300.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_off00005e7a.bin
97dfaa317254eb550cc0d9e29a3d45a9a2e8df46c9831a8ae77ccd74b9f2b38f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 5064 bytes
font_01_sfnt_off00006f8c.bin
980d29a09992be5cefa5ed519eb0daf07951683c383e39c6ebeef4888a70c9cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C 10048 bytes
font_02_sfnt_off000091e1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E1 4324 bytes

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