Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4cc26a86b17274…

MALICIOUS

PDF

58.0 KB Created: 2020-08-05 23:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db0cb900293b08d5ab292bd1a6d94c69 SHA-1: 83cad6ec00b7b6b4a283a613a73ac1100ccb4a32 SHA-256: ae4cc26a86b17274957b48ce1c3d34bf72ebc509c29b8fef941f021a1e6b4ad3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for 'Autocad 3d commands pdf download'. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many pointing to Shopify, likely to improve search engine ranking for the malicious lure. The ML_NYX_PDF_MALICIOUS heuristic further confirms the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=autocad+3d+commands+pdf+download
    • http://files.creedpaintings.com/uploads/1/3/1/3/131398219/tujusezumo.pdf
    • http://files.naturespinnacle.com/uploads/1/3/1/3/131380420/zetifug.pdf
    • http://files.abbeykojima.com/uploads/1/3/1/4/131452935/jedomiselojebufowok.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/bowevu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/alkaloids_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/1434/7160/files/59033306336.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/37317388947.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9328/files/rebesekopokozexad.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/punosimikokixeril.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/62273147688.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/99383124167.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/22346874039.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/tebenubirumomimejasud.pdf
    • https://cdn.shopify.com/s/files/1/0429/1464/4127/files/43910075083.pdf
    • https://cdn.shopify.com/s/files/1/0429/6245/2643/files/kuritamuwulurewojawutotep.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/91072586731.pdf
    • https://cdn.shopify.com/s/files/1/0434/9856/9888/files/46399828119.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_off0000a50b.bin
312000a1c8c006472d3be6c6df3cd2cc6edbad9b0261184cbcc9602eb534de19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50B 5452 bytes
font_01_sfnt_off0000b7a1.bin
0126029309b8ee7c9b43959d4e3ad6eb5991d0eb471a5f8c3a645a7025025eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A1 10296 bytes

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