Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bb42bde4f50ec9…

MALICIOUS

PDF

57.9 KB Created: 2020-08-29 18:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6bcf41afc129198051c3fd0fc181fb7 SHA-1: 356c9a396a4748bc64ec50a99a74ec2eda11ab68 SHA-256: 90bb42bde4f50ec9d9b1bcc61180b43cc1ef90700384a76bedb48a2e805e3ef7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a link farm. The primary malicious redirector URL is https://ttraff.ru/wix?keyword=arizona+articulation+proficiency+scale+standard+score. Many other links point to Shopify domains, suggesting a coordinated effort to distribute malicious content or manipulate search results. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=arizona+articulation+proficiency+scale+standard+score
    • https://cdn.shopify.com/s/files/1/0431/5840/5276/files/zusimajugubizeluginojaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/rataxasiwidanux.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/23503612777.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdf
    • https://static.usrfiles.com/ugd/0a593f_70b8d1cf9bf64069af18360217d9ac04.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/dilimiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9423/6572/files/above_the_clouds_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/53996507206.pdf
    • https://cdn.shopify.com/s/files/1/0462/6943/1959/files/sutenirurodaxipufed.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfed9ebc918b4d52865bbd421d05ae79.pdf
    • https://static.usrfiles.com/ugd/277b62_39c4f931d85e4ec998b568f47bdcc2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_2514bf244c0642bd965e8c4b80d22643.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_off0000a678.bin
43b635f4d57f4e3534e39830e55b0328393ee8bf823929f48b5317718a2cc3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA678 5292 bytes
font_01_sfnt_off0000b893.bin
6867482a33f44f2034e5e159ffcca5f8bd801f295e85d0720d1cdf02dab62967		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 10076 bytes

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