Malicious PDF — malware analysis report

Static analysis result for SHA-256 926eedfc5a5f80b9…

MALICIOUS

PDF

39.2 KB Created: 2020-09-01 08:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0222c81db0e7b61deb39a18904d35783 SHA-1: 75eb7932c04bfa961370272462afec7863101bdd SHA-256: 926eedfc5a5f80b9a122f88252ee58701b239a110578aa73c1833ddc051e0167
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=building+design+plan+and+elevation+pdf'. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=building+design+plan+and+elevation+pdf
    • https://static.usrfiles.com/ugd/63022f_bf1a74da54f54fcb9efb3fc75edc3fe2.pdf
    • https://static.usrfiles.com/ugd/55cc32_b34bd94e768c41138f05302181833588.pdf
    • https://static.usrfiles.com/ugd/b8c837_174ab6561b664d5b82f7dc4a5152aaf6.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/3127509707.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/keto_meal_plan_for_weight_loss.pdf
    • https://cdn.shopify.com/s/files/1/0437/1283/9834/files/m_a_l_ki_full_form.pdf
    • https://static.usrfiles.com/ugd/33c377_b13e32822ad044689f5e99dacd2605f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_12120018c73c4e18bcc4a6a855f1e97d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/lapivuzutit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/asamblea_nacional_constituyente_1991.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/economics_project_class_12_cover_page.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/zenobutobi.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_off00005b65.bin
d11580b111ad3bad6ec0ece11f42ac1a38e08841505ebc9bff0aad911663b886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B65 5224 bytes
font_01_sfnt_off00006d54.bin
8bfcc5cc160c8305965cb35fe20ba09d827f057444a68476a00c025fac237842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D54 10212 bytes

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