Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc38ff8f1e7823e…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 22:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f82cbf7dd4b1d89bd4222af52ace2488 SHA-1: 86dec401940b6d9c89848f77964b683774dd7aec SHA-256: dfc38ff8f1e7823e3b32b57bf660b8fbd7c1d4ad2b0beeb254f12503e25a1db6
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised with text related to video game cheats. This indicates a social engineering lure to entice users to click the malicious link. The ML classifier strongly supports the malicious nature of this PDF. The embedded URLs are part of a link farm, with the primary malicious URL being ttraff.cc.

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.cc/wix?keyword=gta+v+money+cheats+ps4+story+mode
    • https://static.usrfiles.com/ugd/b8c837_f2933df0f45a4e1c93f0ae2af8fecf26.pdf
    • https://static.usrfiles.com/ugd/d43733_a67c3bdec32644b4a56d1182d4522d63.pdf
    • https://static.usrfiles.com/ugd/b8c837_57978bbb18fc40db95180635c483c4db.pdf
    • https://static.usrfiles.com/ugd/b8c837_d22b7b1c7ebd4c4f93e4430c7519d839.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a77fbba861a436f9ccbe225fd91bce4.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_f1e1966937cf4310aaad92a5a1ac8afe.pdf
    • https://static.usrfiles.com/ugd/26481d_d44e878b4ca749c6a6b1301f06ecb644.pdf
    • https://static.usrfiles.com/ugd/b8c837_df1eccf167f74f62aa404de7dda292d6.pdf
    • https://static.usrfiles.com/ugd/99afdc_04c499fd50b840d28c82dda3f62e50f6.pdf
    • https://static.usrfiles.com/ugd/c618e9_443e6c0b69a4472f9e4ef045bcecc7b9.pdf
    • https://static.usrfiles.com/ugd/374ce0_73e04748fc5c43a3a3df64092c0ea248.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizuvesadumewagetikuxumut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/77865178393.pdf
    • https://cdn.shopify.com/s/files/1/0445/8224/0420/files/report_card_comments_for_new_esl_students.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/lagu_ambiguous_btob_instrumental.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_off00006d45.bin
63ca908f8f29c222a82374e2037e006643c2b0f337931966dfe4aa71612c4e82
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 5560 bytes
font_01_sfnt_off0000801a.bin
ce73b3b0372d677b6eddf162894da9c73a2e2f1585e722b99790062db72cc760
pdf-font-stream PDF embedded font (sfnt) at offset 0x801A 10372 bytes