Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae9f469e32877e8…

MALICIOUS

PDF

57.4 KB Created: 2020-08-30 04:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8526e52ffaedb38f75cd799f2cefe8a SHA-1: 6f6823f86c3ad7b5b31cf2cba3f82a89b8bfa097 SHA-256: 5ae9f469e32877e8ebe2dfd4f8ee50549ba963ca5198a62cf7c9318ff120493d
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, masquerading as a bodybuilding manual. One of these links, https://ttraff.ru/wix?keyword=bodybuilding+exercises+manual+pdf, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards a phishing or redirection attack.

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/wix?keyword=bodybuilding+exercises+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0132/3420/files/visio_2010_org_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/1732/9064/files/vumubawexasumaxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8739/6004/files/may_2020_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/aes_encryption_example.pdf
    • https://cdn.shopify.com/s/files/1/0466/5144/1317/files/capsicum_nutrition_guide.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_7930fcbcdfe348f3b782cef0629e58f6.pdf
    • https://static.usrfiles.com/ugd/d1c05f_dad9edbca86a47f6b2011bd568b02cc3.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ea740ec6fee41138c0288dc9855f91c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf840f32a4434f0f821d515fb9d5e80e.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/66692456179.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6331/files/xelij.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/relatrio_de_auditoria_interna_exemplo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/poor_richard_s_almanack_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3046/files/brain_on_fire_download_free.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085e2.bin
552d88f201445c6bd0aab4fdada801b1bfba203b3d32d469166bc4fd700b2074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E2 5832 bytes
font_01_sfnt_off000099ad.bin
458a106dbd318473bcf231731716fa2a332c3e2281e63ec81086b4d98ed60441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AD 10868 bytes
font_02_sfnt_off0000bd9d.bin
64e6b31aca4ec4f2d80a9ad419c15e6f28c7213d9139e8aa80c6bfa4ddcea497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9D 17672 bytes

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