Malicious PDF — malware analysis report

Static analysis result for SHA-256 934f3ac6e72bb626…

MALICIOUS

PDF

63.6 KB Created: 2020-07-24 09:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1b1851f89c239eb9a42756bad079967 SHA-1: 40155d3e7ab0283b2cd74a7a3cf9d6493658aa23 SHA-256: 934f3ac6e72bb626a3b405b26ff1f652a4cb0755aa15c6de7e66b0f9ced160b6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to 'lawn mower' and 'consumer reports', suggesting a lure to disguise the malicious intent. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing and a high ML score strongly indicate malicious activity. The primary attack pattern involves redirecting users to potentially harmful websites.

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.ru/pify?keyword=best+riding+lawn+mower+2019+consumer+reports
    • http://files.bethinkcreate.com/uploads/1/3/2/7/132740218/70bd1ff781.pdf
    • http://files.msfullfigureddmv.com/uploads/1/3/0/7/130775732/8b80122a1e655.pdf
    • http://files.internationalflowartsday.org/uploads/1/3/0/8/130874222/661369c05c3e4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/saxekorujusojesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/22404806802.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/98708100623.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/tamumefatefusobavoxox.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/44973733849.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/13058783165.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/wekatepefetijuxogaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/repamasonuro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/24150922139.pdf
    • https://cdn.shopify.com/s/files/1/0430/8425/1285/files/bikojezaludedekixunilado.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/42441001163.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/rikebenegisogomofomo.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/
    • https://cdn.shopify.com/s/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8b0.bin
4c389d3894a50ad6e453f88fde56e4dccbbaf3f46efd1ac6a3b2a282d9af4cfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B0 5896 bytes
font_01_sfnt_off0000ccbd.bin
662629bfd34abcbe2e722ee4d102e7f21ca07e022c40b8312f49209aac219f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBD 10620 bytes

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