Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a7084bd0d19f1b…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 06:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd60b03712aeda8f64f74b9cee2432d SHA-1: 63bce91e7d840f959f8758f3b17ee2b212d3d451 SHA-256: 18a7084bd0d19f1b92ae7dc466ca059a36cd4988d21f9ed0e78b594ad7ea6859
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 of which point to a redirector service. The primary malicious URL identified is ttraff.com, which is known for malicious redirection. The document body, though heavily obfuscated, contains references to URLs that appear to be part of a link farm, suggesting an attempt to manipulate search engine results or lure users through deceptive content. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate malicious intent.

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=wrap+text+in+excel+mac
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/37155448030.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6062/files/bicol_region_literature.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/plant_embryo_development.pdf
    • https://static.usrfiles.com/ugd/9734e7_9e03250aa4c045e08845735b5b24ad6a.pdf
    • https://static.usrfiles.com/ugd/913720_9e1ebce24b79455bace141aafff40cf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d37f782aa0d8453083f83d42f24afbc5.pdf
    • https://static.usrfiles.com/ugd/b8c837_06dea61e9b6045e2b43814f8eef68f97.pdf
    • https://static.usrfiles.com/ugd/22739b_5b5aeaf9f34646d08c1781a928c2bbef.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ff7f1d9d89e4e2789087cad1ca41012.pdf
    • https://static.usrfiles.com/ugd/ab922d_5fc92992346e45b3aae2402a5582bbcb.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc6933162151455281b8f86a392b2165.pdf
    • https://static.usrfiles.com/ugd/f967ac_9812b283f38b4856a3d971e7221da33d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_49f243c5f75840f091a5ef3ee753049c.pdf
    • https://static.usrfiles.com/ugd/726ec9_19bf0c228d4640d886077cbe8de7dd05.pdf
    • https://static.usrfiles.com/ugd/3de8a6_245a943420f8482e8259e13ab9fd51f3.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_off00006f51.bin
6e80cd558b2a3229c7dc31b84c3a63a041af4bc19b04586cd0ff74a96963015c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F51 4980 bytes
font_01_sfnt_off00008039.bin
1be266f98958f0768fe5810909fa215d8a71a60ad0957b874fe8ccd84acfe9e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8039 10352 bytes

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