Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3ef0969eb5c23d…

MALICIOUS

PDF

47.1 KB Created: 2020-08-14 18:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c159d2577c98a3d30570a9db4ff66d5 SHA-1: 2b1f45a49325a70b1801686a70aa9351a03e5ab6 SHA-256: 6d3ef0969eb5c23df02ce4a5f55be5f43733e0789f4e945e93f8bcc58ff8717b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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.cc/wb?keyword=professional%20ethics%20of%20doctors%20pdf
    • http://files.fulltiltk9training.org/uploads/1/3/0/9/130968984/duxabeve.pdf
    • http://files.24millstillrd.com/uploads/1/3/0/9/130969440/7332203.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/67719094585.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/87728970944.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/sanitary_napkins_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/0513/2456/files/diramosuzofuwipaki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/bugbear_5e_volo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/36243184694.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/minecraft_cape_uploader.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/98025816750.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/sklearn_logistic_regression.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/zokomot.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/analog_and_digital_communication_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/37570929786.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/divekuvunesos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/96812545854.pdf
    • https://cdn.shopify.com/s/files/1/0433/4678/8502/files/67226167541.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079eb.bin
cae2d7d454fc63febaef8d4a5dc8e1db0d10fed9e5547681d7c8683bb3b03c04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79EB 5244 bytes
font_01_sfnt_off00008bb0.bin
1a2805b1bee59dbd603f854be2491a725bbd08e98f2c0c4bb61d2407823be00e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB0 10500 bytes

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