Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f49afcbc7beb8b0…

MALICIOUS

PDF

35.0 KB Created: 2020-08-24 01:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b147f629a44f96df4a72147734cd47 SHA-1: 978a183a682b0093b131c798d9c3f1f19d777fac SHA-256: 8f49afcbc7beb8b0c17f5936ef839b39d6e2ca0907b663d5fb884862b2f42882
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a weather report, but the primary link redirects to a known malicious infrastructure at 'ttraff.ru'. This suggests a phishing or redirection attempt to deliver further malicious content. The ML classifier strongly supports the malicious nature of this 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.ru/pify?keyword=weather+report+grayling+michigan
    • http://files.rochachamama.com/uploads/1/3/1/4/131482975/nisajekaretije.pdf
    • https://cdn.shopify.com/s/files/1/0431/6712/1565/files/39070926206.pdf
    • https://cdn.shopify.com/s/files/1/0435/8697/7949/files/setojixafuranol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/download_mac_os_sierra.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8799/files/naxukevokotosovisabises.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/poterotitovanivozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3582/8124/files/32589138630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/naduz.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/gunufowa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/65491759732.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/miripox.pdf
    • https://cdn.shopify.com/s/files/1/0436/8292/2646/files/53715655035.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/2852214038.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_off00004ad4.bin
93ad936ac645b1f85b632c75c96837a85b19dedb7e40985fa6824f6af83a0c4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD4 5284 bytes
font_01_sfnt_off00005cb7.bin
389549157e6262051f9399cfd14f6f08e4b16a2c70d61a972baf5998b9fd454f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 10180 bytes

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