Malicious PDF — malware analysis report

Static analysis result for SHA-256 474c1a9af72f65c2…

MALICIOUS

PDF

40.4 KB Created: 2020-08-27 19:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 471a9e73e762bc01fc8bc04e94196437 SHA-1: 29fdb9a5d12111896f6454c9ded7125f418a938f SHA-256: 474c1a9af72f65c2eeeb593671a88534d75eca2b940f8a921c0093fc7405c63b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link that redirects to a known malicious domain, disguised as a manual for a Texas Instruments Nspire CX calculator. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirector. The PDF also contains a link farm, indicated by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to distribute content widely. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=texas+instruments+nspire+cx+manual
    • http://files.lindsayreissnsf.com/uploads/1/3/1/4/131438616/nolesupulukarok.pdf
    • http://jegesid.uniquelyyourscandles.com/uploads/1/3/0/8/130874257/sakebuperaled.pdf
    • http://files.urbanaohio.com/uploads/1/3/1/3/131398093/2884060.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/fun_critical_thinking_activities.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/kaduno.pdf
    • https://cdn.shopify.com/s/files/1/0432/2734/9159/files/tobomozufatoxijiselozo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/php_multiple_file_upload.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3157/files/pimaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8099/8298/files/simple_household_budget_excel_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/8079/2729/files/3rd_grade_eog_math_practice_worksheets_nc.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/ets_toefl_official_guide_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/appsc_previous_papers_with_key.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_off00006293.bin
89e34bd2a7b51533f73bd20a2fb1e0a11ba1e0cbfd438f599ac230f8d68e2ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6293 5096 bytes
font_01_sfnt_off000073c8.bin
35b65b48a9a8cb1941c332cc09399e3f4f4f5f04cd26bd8de0c8cd057b18e82e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 9636 bytes

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