Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b024caddf7e94a8…

MALICIOUS

PDF

35.5 KB Created: 2020-09-21 16:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba7b4bdc310d6c57b1f8c9339892d482 SHA-1: 459ece10d8dfe51d071cf4bd6203be51b829b658 SHA-256: 2b024caddf7e94a8c7f65d7d34f5edd75bdc82e52d7fef89c54104f0ff64e33d
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic firing on a malicious redirector URL. The document body, though heavily obfuscated, contains the malicious URL and other links that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.link/wix?keyword=auxiliary+view+creo
    • http://files.poorhousecandles.com/uploads/1/3/0/7/130738971/2189267.pdf
    • http://files.positiveimpact4health.com/uploads/1/3/2/7/132740618/771065dabd95.pdf
    • https://cdn.shopify.com/s/files/1/0446/1946/4867/files/que_es_el_albinismo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0050/files/punic_wars_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/7068/4317/files/75367453577.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/fiwek.pdf
    • https://793241f3-3faa-4818-ae53-7f2b460a697a.filesusr.com/ugd/daca0d_112d286224c3454aa1b75f113a8af21e.pdf?index=true
    • https://ccb9ddfa-b51a-4c81-b7e1-f097e03add4a.filesusr.com/ugd/ccf397_f41e340fb8394eb098ba81efe7e997f9.pdf?index=true
    • https://4f33eab9-87dd-454c-9a91-a68120bc3adb.filesusr.com/ugd/fdd6c2_e84bc670a5074e5cba44cb05c4b82a83.pdf?index=true
    • https://00578720-13fc-42bd-9e63-7fc7799b57db.filesusr.com/ugd/9cfd0a_bcfd7263446642ae8d1eed1e7b2bd743.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/7614/0710/files/crayon_font_for_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/romufal.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_off00004f17.bin
ab362cd1bdb349357df97a5281b065411494bee9b69a8845450d701c3806a727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F17 4928 bytes
font_01_sfnt_off00006006.bin
2bf6f8189e2827db785051eb7193db9ad39b1893c301c05e497729fbedec655c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6006 9872 bytes

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