Malicious PDF — malware analysis report

Static analysis result for SHA-256 13861acdde619288…

MALICIOUS

PDF

40.2 KB Created: 2020-08-08 08:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b7303e5104c310da21a3d5a658031f2 SHA-1: 7048957e6d7d9c6293c36ae3c131af29f65e060f SHA-256: 13861acdde6192886150a682cf8140960dbeb2bfd393c69887263191a23276d0
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, designed to obscure the ultimate destination. The primary malicious link, 'https://ttraff.cc/wb?keyword=jumbled%20sentences%20worksheets%20grade%2010', is identified as a redirector to malicious infrastructure. The presence of a download button lure further supports the intent to trick users into clicking through to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=jumbled%20sentences%20worksheets%20grade%2010
    • http://files.jessesclassics.com/uploads/1/3/1/3/131384335/2164164.pdf
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdf
    • http://files.drickahair.com/uploads/1/3/1/4/131438658/6269460.pdf
    • http://files.nicoleedwardsauthor.com/uploads/1/3/2/6/132680822/3230355.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/15644856374.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/beginners_guide_to_real_estate_investing.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/pig_latin_converter.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/management_schermerhorn_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/kejafuxutib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/basugogigarerebid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0065/1158/files/formato_de_certificado_medico_de_farmacias_similares.pdf
    • https://cdn.shopify.com/s/files/1/0436/6719/4021/files/4162004328.pdf
    • https://cdn.shopify.com/s/files/1/0436/4160/2198/files/74557676171.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/xurubeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/5672490985.pdf
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/javascript_split_array_into_chunks.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/agroforestry_lecture_notes.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_off00005d68.bin
c3d74f2fefa9ae90d96ff7c822ad2b82616ef72c6edc83e41e4687e0578fd2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D68 5832 bytes
font_01_sfnt_off00007125.bin
3745fdac652ac6ada816a39c8d2397655a3fb7c11a26aaa46c17a302d593d547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 10160 bytes

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