Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35cab0f7936f12a…

MALICIOUS

PDF

39.4 KB Created: 2020-08-10 23:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29da873b0b430c9d2bd10c4155e5d51f SHA-1: e7aa97b36d4e9d381db399e81200515fe1a779b0 SHA-256: d35cab0f7936f12a56153c606334ff80627886b209c3b0218f1a6a5da24ae893
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking Shopify URLs, likely used to mask the malicious activity.

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.ru/pify?keyword=ada+diabetes+guidelines+2020+pdf+download
    • http://files.synergymedicines.com/uploads/1/3/1/3/131379296/8786241.pdf
    • http://files.ruthscheuing.com/uploads/1/3/1/4/131454696/2215348.pdf
    • http://files.leatherworksfordogs.com/uploads/1/3/2/6/132682070/segunexevanisew.pdf
    • http://motomike.sweetreams.net/uploads/1/3/0/8/130873995/213c3f7c5fe3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5599/6328/files/14913965191.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/16372108926.pdf
    • https://cdn.shopify.com/s/files/1/0430/7206/1591/files/85357906889.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/fade_to_black_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/95940881593.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/11685373257.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6726/files/66091974547.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/2990708282.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/batho_pele_principles_kzn.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/94863792287.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/jakawuluragozebugebigoku.pdf
    • https://cdn.shopify.com/s/files/1/0439/6656/2462/files/comic_storyboard_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/mesikidagifizojukadu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b27.bin
455b4a436d9a9e09104516f307623b88c38bcc198e5979736c51cc93f932f9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B27 5608 bytes
font_01_sfnt_off00006e5a.bin
fc165ebb64295cb0e2fc121f82b1ff96921b547a6ed073b1c05bd10a9ab80750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5A 9960 bytes

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