Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c21eb340014acf5…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 11:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63bf7673205f6e8eafdb8c543b4d5dfe SHA-1: 864227dedd2dad9df7dd3a63060aa2215128ec20 SHA-256: 7c21eb340014acf5f9075d645f4993634e123b1ea08e65a3a06937d15c9f315f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with the primary link directing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to obscure malicious intent or distribute malware. No scripts were extracted, and the document body was heavily obfuscated.

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=muller+v+oregon+nancy+woloch
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e4ff69_eb6e5e80e8ad494cbc1fe2998fdc4f4d.pdf
    • https://static.usrfiles.com/ugd/40512e_ded48540ed2345e5818c39c64c9a5aea.pdf
    • https://static.usrfiles.com/ugd/b8c837_29ad22c65e514da99772012ea466b01c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef293696e40146b081cc655ead63f4dd.pdf
    • https://static.usrfiles.com/ugd/3fc21f_b134bcf41a0d456d86f9f267aa8198cd.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/terminal_automation_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/zoxewinabenibamalefok.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3705/files/que_es_un_contexto_social.pdf
    • https://cdn.shopify.com/s/files/1/0430/1425/8851/files/bikigoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/cutting_edge_3rd_edition_advanced_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/salobixopatem.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/lefagosukebipikapawisud.pdf
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/25986454942.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/povebaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2887/files/genel_muhasebe_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/2657/9610/files/882197068.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/jomipoveda.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/26046183435.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_off000069f1.bin
618e9679ce2d567c71d442da11a2a675347706f7e622cd5509e021c5a9214ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F1 5140 bytes
font_01_sfnt_off00007b8c.bin
24d4e9749427649a738be651592b8f49951b725b61c1a371240f0289376d5de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8C 9908 bytes

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