Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a2fe3f5bd0419f…

MALICIOUS

PDF

43.6 KB Created: 2020-07-28 11:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97cd644da4ba70095df9beab2a98416d SHA-1: 0a6d6423b2d8dc04cd7f6124c5323e3d54dc1622 SHA-256: 51a2fe3f5bd0419f4963ceb80675aa3085a68a1e2e692523cfeebe98ed2c8c8e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.ru/pify?keyword=parquet+file+format+in+spark'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one pointing to 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70277109097.pdf'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to contain metadata related to the 'Parquet file format in spark' lure.

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=parquet+file+format+in+spark
    • http://files.loiscolemanneufeld.com/uploads/1/3/0/7/130738969/texasevomadezu_depiforevukenis_xetakovanimiz.pdf
    • http://files.artfromaveganheart.com/uploads/1/3/0/8/130814980/medajo.pdf
    • http://files.hansroegelearchitect.com/uploads/1/3/1/4/131408581/wizikupopofafurularu.pdf
    • http://files.loiscolemanneufeld.com/uploads/1/3/0/7/130738969/texasevomad
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70277109097.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/47959384684.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/56002415729.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/pobabulowadotebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/jetubegetasav.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/39680257031.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/48423656250.pdf
    • https://cdn.shopify.com/s/files/1/0435/9539/9325/files/95046884535.pdf
    • https://cdn.shopify.com/s/files/1/0438/4194/5760/files/guvinokedegagijut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/duzeze.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/86168475247.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_off00006bed.bin
fa33d468b395a23b6b7e26a8902ad1c7e8bba56af23dec5124072d90f3ec7fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BED 5120 bytes
font_01_sfnt_off00007d45.bin
8dca4699718bf17f2c28afcfb5f7cc374bcd942ff275559a714e1bb92bccf3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D45 10620 bytes

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