Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ee87e79bdc086…

MALICIOUS

PDF

62.0 KB Created: 2020-08-12 17:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9de6dc8dbf593bd083fa34342ca9c654 SHA-1: 753b354375ab958399c2ec8390e1bf7fd8033d07 SHA-256: cb5ee87e79bdc08656e65fc88c9e1de9febf59e5ebd1947d1487f7204028fc83
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL designed to look like a search result for 'arduino pdf beginner'. The document body also contains this URL. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which point to Shopify domains hosting other PDFs. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious content via a seemingly legitimate search result.

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.ru/pify?keyword=arduino+pdf+beginner
    • http://files.mayaartcenter.com/uploads/1/3/1/3/131398094/niwenal-vijenelowez-gosejugid.pdf
    • http://files.marybhetz.com/uploads/1/3/1/8/131871704/rodasusarapuj-nojesazawinomud.pdf
    • http://maworanup.mrviens.org/uploads/1/3/1/0/131069839/286271.pdf
    • http://files.sablecatalchemy.com/uploads/1/3/1/6/131606670/resijejorujin-kuturevute-vipoz.pdf
    • https://cdn.shopify.com/s/files/1/0448/2121/7442/files/cube_and_cuboid_formula.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/10th_class_science_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/damipedexom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/masarri_real_love.pdf
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/dimobixewusexomolusivona.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6397/files/3989004827.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/toxol.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/97662346218.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/nefabuwofuwomubixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/girekigakosagisorusuxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/mijibazinisikelenad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b66.bin
055b83f4a01330621e5cad3ba61378e22312bb81d6c41210fdec12c57628bd3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B66 4720 bytes
font_01_sfnt_off0000ab6f.bin
666aa1d7aa6af8914d02eff6e1e2b81e53e9c5523f5a4d280dd6e1d2aecf9584
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6F 15916 bytes
font_02_sfnt_off0000dd00.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 4324 bytes