Malicious PDF — malware analysis report

Static analysis result for SHA-256 565eb3ffa444c0d4…

MALICIOUS

PDF

48.0 KB Created: 2020-08-13 09:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17db374f8c511900e5a368d7a618e52f SHA-1: b54343185db3cf35e20d80011307b2f0ec12449b SHA-256: 565eb3ffa444c0d40dfda86c2877e210b1715c95909e16044bb4f73caa49e223
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a car model and the authoring application, suggesting a lure. The presence of numerous external links, many hosted on Shopify, indicates a potential SEO link farm or a method to distribute malicious content through seemingly benign hosting. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=2006%20saab%209-3%20manual%20transmission
    • http://files.logosart.com.hk/uploads/1/3/1/6/131606533/bonokidufezobijariji.pdf
    • http://sagusa.petebarryspiritualmedium.co.uk/uploads/1/3/1/4/131408899/vonivide.pdf
    • http://files.gameaccess.net/uploads/1/3/1/6/131637108/d3084b3a90447.pdf
    • http://files.nordmanlab.com/uploads/1/3/1/4/131437693/37951c.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/adobe_for_mac_os_x.pdf
    • https://cdn.shopify.com/s/files/1/0450/8804/7256/files/how_to_set_up_nightbot.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6750/files/edit_file_with_adobe_acrobat_x_pro.pdf
    • https://cdn.shopify.com/s/files/1/0437/4819/6513/files/kannada_bigg_boss_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52244446143.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/subokinolimuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/fadeposomezizug.pdf
    • https://cdn.shopify.com/s/files/1/0435/6472/8479/files/paulk_workbench_plans_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/kenokojuzaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/tomcat_redirect_http_to_https.pdf
    • https://cdn.shopify.com/s/files/1/0436/4868/0089/files/practical_botany_for_gardeners.pdf
    • https://cdn.shopify.com/s/files/1/0430/2661/2378/files/stored_procedure_in_sql_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/mevoxufuvovusukikegi.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_off00007866.bin
9e1a489294ae52633005317d707cffe132d51d75cc92c3727287baa1bdd09887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7866 5656 bytes
font_01_sfnt_off00008b6c.bin
0cf931d5fb950692821594cffef215f9f95a773c4e3f6fd472f481751bd3a2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6C 12304 bytes

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