Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a82d68b217c3e8…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 22:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 779b663a9eaad4f405cdff934609f47b SHA-1: b2536a7f638532177c6723e5ae151deff3efead0 SHA-256: 09a82d68b217c3e87ccd1a1c3b12cc02eae2d58435a7ed55c67679955294a1bf
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The heuristic 'PDF_SEO_LINK_FARM' suggests this PDF is part of a larger link farm, likely for SEO manipulation or distributing malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards a malicious intent, possibly involving a drive-by download or phishing attempt.

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=broussonetia+luzonica+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b22a068bcf0949e3abe4af7e7f038f4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4bc4cbd660640e69b3ca07eab886e1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d77f2b57c8a43fd8b1c7c0d218342df.pdf
    • https://static.usrfiles.com/ugd/804ff6_0ea7bec0c4d4402aa8259b10c55669e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e125ae4e91294d01ae199ca72fba06ab.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/word_document_to_converter_free_download_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/4735/2480/files/nogixalisob.pdf
    • https://cdn.shopify.com/s/files/1/0462/5170/4469/files/48813996309.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/napukozibaxotijuwozud.pdf
    • https://static.usrfiles.com/ugd/d902bb_cf1619fa670945c9893f4efb2c486d19.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_c51cb521eb454d3394125d47fa250615.pdf
    • https://static.usrfiles.com/ugd/3aee12_ebdac348927041548dc497efd8428112.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b50bcbcf018438aa93353c7cc087134.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/latex_long_tables.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/canon_t5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/dasajejujafagujojatira.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_off00005bc8.bin
9c2243c77e4e73a28abb6e74c9dd321e837b279fdf55636c44b859d7d1ddcad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC8 5248 bytes
font_01_sfnt_off00006db9.bin
ab9f99f8611d1f5b326b83631645ae6a8cfeefb1962787f08dbf6610f57a1368		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB9 10536 bytes

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