Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c4315436dc06ee…

MALICIOUS

PDF

51.7 KB Created: 2020-08-12 09:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83b5283828736d2d26b9c2f47a9383c5 SHA-1: 6e9bafec721dd894c00e51db0f0d0bbba745d3bf SHA-256: c8c4315436dc06ee33cbcd3eced0584d874bebf4bf3b66c25f39c18d535b44f0
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wb?keyword=fixing%20a%20hole%20in%20the%20sky%20worksheet%20answers%20central%20case'. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to a worksheet answer key. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on cdn.shopify.com, likely for SEO manipulation to increase visibility.

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.com/wb?keyword=fixing%20a%20hole%20in%20the%20sky%20worksheet%20answers%20central%20case
    • http://files.pitchforkpreserves.com/uploads/1/3/0/7/130739340/5110528.pdf
    • http://files.sixteencoop.co.uk/uploads/1/3/2/6/132695576/kikaxe_witipi_xebov_zasotewubewes.pdf
    • http://files.nancymaldonado.com/uploads/1/3/0/8/130874110/rafaruke_xujuxuwep.pdf
    • http://perel.spreadsheetsage.com/uploads/1/3/2/6/132695278/6299158.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/random_expression_generator.pdf
    • https://cdn.shopify.com/s/files/1/0445/4970/1796/files/tewanemaludolipinalis.pdf
    • https://cdn.shopify.com/s/files/1/0428/7627/2796/files/91543830195.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/sql_stored_procedure_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/dekinilapupuzegudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/lazulamugegudapuxojiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/77188927050.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5547/files/78944523447.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/doxarusizaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/8614/1847/files/pirates_of_the_caribbean_theme_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/45982472154.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/90096928937.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_off0000819e.bin
9a68b65e3279f57d2a6d2db85cbf362c03584f6073a8a418bafa8c47e9604c38
pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 5340 bytes
font_01_sfnt_off000093e2.bin
79a90b0c735227dd74510322b6d149d9cc4225d7aab9520fd26d11e4cee2f16a
pdf-font-stream PDF embedded font (sfnt) at offset 0x93E2 14412 bytes