Malicious PDF — malware analysis report

Static analysis result for SHA-256 7560b49d26ac5989…

MALICIOUS

PDF

45.8 KB Created: 2020-09-02 03:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d8d1255c5c6bca2d8eb449e4ed289b8 SHA-1: 725874acd726895d88cb439611e3fc0d67f3809c SHA-256: 7560b49d26ac5989cf09d087e3b618c0aa3accb00e45258a2c6bfa201f16026d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links, 'ttraff.com', is identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=chinese+art+market+report', reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=chinese+art+market+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d94ae5_1630e134256444188a9f12b1d530171f.pdf
    • https://static.usrfiles.com/ugd/40512e_f51be84ed46a4ae4b40a3fd1aae07752.pdf
    • https://static.usrfiles.com/ugd/9c43ec_534a24be45cc4830aec75972b072042d.pdf
    • https://static.usrfiles.com/ugd/50c35f_3d532e830194405da07a317d4c226281.pdf
    • https://static.usrfiles.com/ugd/217b8a_47362f9e1c8d49f0ad813b353418cc00.pdf
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/woxejidoratitulapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xefafozerokadugatevaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/14378470438.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/triple_integrals_in_spherical_coordinates.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e3d2afce0414796b97d8b1b9369c023.pdf
    • https://static.usrfiles.com/ugd/77eba6_60c1800e8fe34aa09f91d4b3bf03ef83.pdf
    • https://static.usrfiles.com/ugd/fe0276_e7e54cd4c3b04328ad6dedad6cfcb7eb.pdf
    • https://static.usrfiles.com/ugd/06497e_f04fbe826b104dbe9e62eaf9ef6de50c.pdf
    • https://static.usrfiles.com/ugd/83b1b3_be1d86ac81eb411c878c7a2aff0f5a0d.pdf
    • https://static.usrfiles.com/ugd/5899d5_e1f7f7ad5b5840909492f86575c710be.pdf
    • https://static.usrfiles.com/ugd/b8c837_2734c83abdf44af1a55532e2184037fa.pdf
    • https://static.usrfiles.com/ugd/289c5e_86e427a02c45487a9946153a683545ee.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_off00007600.bin
72c6d8d2cf29fb22b4973f254926a38ad58589cef30b70870b29717a10441cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 4996 bytes
font_01_sfnt_off000086ce.bin
6aff13a8d93ce4dd8e4c2a0e787ef3fe9915795bc42a98f8094744b15ce9a7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CE 10276 bytes

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