Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4878b6bca6d74d…

MALICIOUS

PDF

34.0 KB Created: 2020-08-31 15:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c15d6aceb9d8070d10cd33779bae1bc SHA-1: 874a7265e6388e9bff0ab64a3aafd54389191391 SHA-256: 6c4878b6bca6d74dacdba1b8b40afddb05015d88bfcf0015a8bfe4d0be40e1f9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO spam or to obscure malicious redirects. One prominent URL, 'https://ttraff.link/wix?keyword=baixar+bushcraft+101+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to drive traffic to malicious infrastructure.

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.link/wix?keyword=baixar+bushcraft+101+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/575363_2b5c2dfe2fa7478886dfeadc65577eb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6be614b22c3548e18788740c7ce0d049.pdf
    • https://static.usrfiles.com/ugd/b8c837_290bc459e8dc47b8aea4d3692838abe0.pdf
    • https://static.usrfiles.com/ugd/8acad3_91a852e2350c44e59b8e26fc3fb8982e.pdf
    • https://static.usrfiles.com/ugd/89363e_700a3bdeda524f0281059bd35bd92d55.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/dokabenesuxugumigitipud.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/24647308414.pdf
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/tropisms_practical_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9299/1399/files/definicion_de_enfermedades_cardiovasculares_oms.pdf
    • https://cdn.shopify.com/s/files/1/0436/0421/3917/files/air_force_pt_test_calculator.pdf
    • https://static.usrfiles.com/ugd/bd5c68_ff4293a235ae4a40b2cbae9b71b4d3d6.pdf
    • https://static.usrfiles.com/ugd/b48b60_06a0ffbabb38423487708e114f7f3855.pdf
    • https://static.usrfiles.com/ugd/173616_8ae60667d77e4eb88f5fc469ce3fffe4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2611ed69e142f2a28598a3986cfe9d.pdf
    • https://static.usrfiles.com/ugd/77941b_2901e4748514490082924088e2156c9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f727f6ac632499190095df9fa5c858d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004826.bin
258e0fe785d2a90d6aa8adf06607710635bf8d1b26c05ff4dba5c2fc3f5c6512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4826 5664 bytes
font_01_sfnt_off00005b6e.bin
59392477a661a1ab113db0470695a758940ff9a782dc4eace1835ddd6c187fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6E 9480 bytes

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