Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c13c3500f5bd687…

MALICIOUS

PDF

36.9 KB Created: 2020-08-22 11:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b82f4bac6966bc41dac9feec6e9b28c SHA-1: 724e9e3e4eb8acf20b0333398d0dca2f1c5c7a9f SHA-256: 0c13c3500f5bd687130d1900f309fbe9b155fa09166ac295c44663b04e188890
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or redirection scheme. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=anime+banner+template+no+text'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's designed to redirect users to harmful content.

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/pify?keyword=anime+banner+template+no+text
    • http://files.buhrmasterfarms.com/uploads/1/3/1/4/131483719/dizevotolubemi.pdf
    • http://files.kathrynclark.net/uploads/1/3/0/7/130776478/a1cbcaa4d8.pdf
    • http://files.beyondtheedgeinstitute.com/uploads/1/3/0/7/130739951/738441.pdf
    • http://files.pchstv.org/uploads/1/3/2/6/132681026/e6b30.pdf
    • http://files.foreverlivingdeliciously.com/uploads/1/3/2/6/132695832/90006b20bef10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/58296561446.pdf
    • https://cdn.shopify.com/s/files/1/0451/0511/9397/files/astral_projection_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/14611104320.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/20487352658.pdf
    • https://cdn.shopify.com/s/files/1/0428/2309/0343/files/vigibuxik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/berlin_definition_ards.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48054684450.pdf
    • https://cdn.shopify.com/s/files/1/0456/8471/9775/files/botw_divine_beast_elephant_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/21344236104.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/python_data_analysis_projects.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/convert_to_form_online.pdf
    • https://cdn.shopify.com/s/files/1/0439/1141/3912/files/nelodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/63656475628.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/bro_sammy_nsem_foo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/1368222483.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_off000052f5.bin
afba8eaec4eea8462f3d6d8d472e56e16febfd00962750f293e9a08be93b7853		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52F5 4984 bytes
font_01_sfnt_off000063c6.bin
3f0e4fd586dc329a25f57a709b30b850a0e93246f86ceb595f3c215f1bbe4f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 10212 bytes

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