Malicious PDF — malware analysis report

Static analysis result for SHA-256 9641b778e5bb13b3…

MALICIOUS

PDF

38.4 KB Created: 2020-08-31 06:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07e5a86c9aa49217ed001dc1a6eca7df SHA-1: 7ab627e062f01db82bf6f000d5709c506e5b5900 SHA-256: 9641b778e5bb13b3dd1faf3a1b7449462f9ecc4b50d0e2426b630c9a95629d72
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/wix?keyword=gungeon+old+goldie, points to known malicious redirector infrastructure. The document appears to be a link farm designed to distribute traffic to numerous other PDF files, likely for SEO spam or to obscure malicious destinations.

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=gungeon+old+goldie
    • https://static.usrfiles.com/ugd/850f07_41db54fe958442fbb0374587ac9ceb11.pdf
    • https://static.usrfiles.com/ugd/dad90e_fcd6336abe2548b791569cd5009827eb.pdf
    • https://static.usrfiles.com/ugd/374ce0_3bf561a9cf1d4340b8ade78c234c62e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5d220dd90284c729c86f96fde353a67.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ebb7ac336a45559b5f73b668e4f9d6.pdf
    • https://cdn.shopify.com/s/files/1/0435/6138/6147/files/31263409374.pdf
    • https://cdn.shopify.com/s/files/1/0433/8332/4822/files/52821207896.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/wopisemodameludu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1869/0458/files/structural_functionalism_and_conflict_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1949/files/mixorinoduvimubefafuju.pdf
    • https://cdn.shopify.com/s/files/1/0430/6223/1201/files/possessive_form_of_james.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/banev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/64389239354.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/85308843921.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/girufisuluge.pdf
    • https://cdn.shopify.com/s/files/1/0430/9116/5333/files/jetajiwaliretariteviru.pdf
    • https://cdn.shopify.com/s/files/1/0438/4115/9333/files/ansioliticos_efectos_secundarios.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_off00005a28.bin
2ecce2b9db1207a04614aaa2c920e54d35508242b74615a489f9b2c2701b5714
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A28 4540 bytes
font_01_sfnt_off000069b6.bin
9e0995b3c338dc1d21d03d5134bc39ff4b09c9d17a1b846ecb82540e8a7f92ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 10352 bytes