Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d242c7ee7f7691…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 21:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2369082b0b86dd2bf687dfb90470eba5 SHA-1: 535882d5d9a6451c6047abe44c237c01aff562f9 SHA-256: b7d242c7ee7f769121c82561d4386f49ae1414b489e0d572f427a2a16d74bd0f
154 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple external PDFs, with the primary link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting the intent is to redirect users to malicious content.

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/wix?keyword=download+night+changes+one+direction
    • https://static.usrfiles.com/ugd/b8c837_8ed2479aadaa4c2cb37f69309d359a5e.pdf
    • https://static.usrfiles.com/ugd/f09a9d_1e5c37aadae84414a85969afe45ac9a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d16b9d2c77d5454a941cd3e21d0d2f7c.pdf
    • https://static.usrfiles.com/ugd/362633_8a8cc88d5212499385170e521fee6dea.pdf
    • https://static.usrfiles.com/ugd/b8c837_e334b50ff0814d4296a42551ef71dad4.pdf
    • https://static.usrfiles.com/ugd/32777b_adbc19994872498285c1f24d7c10c124.pdf
    • https://static.usrfiles.com/ugd/26938b_cbcea1e1daba45e7923c934e921f2d2b.pdf
    • https://cdn.shopify.com/s/files/1/0459/9378/7559/files/15027605975.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/chehel_kaaf_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/nejiv.pdf
    • https://static.usrfiles.com/ugd/b8c837_afc8f188e4a548d1bacb7fcad7aeffd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be36ac1631b4b15bfdcc26c2d20537c.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_off0000566e.bin
ebcb81bafaf0df1e538a199e9ec1fafceb3634ab39e76b9154e66181af4d9067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566E 5292 bytes
font_01_sfnt_off00006875.bin
17126f54b561089e0052bab23ee588d6cdb425aa3f70c86068d01c2fc19cff66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 16636 bytes

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