Malicious PDF — malware analysis report

Static analysis result for SHA-256 87be4575fb5ed28d…

MALICIOUS

PDF

44.0 KB Created: 2020-08-15 02:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f06125e3ba0d614e7361df23391987fc SHA-1: 89c2006777c624f9a6a3f9439e9cc052b69b81c0 SHA-256: 87be4575fb5ed28d700de3d6cc76e0e098886ac87fbc16367b499e43cdef33f0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/wb?keyword=mickiewicz%20ballady%20pdf. The document body, though heavily obfuscated, also contains this URL, suggesting it is the intended destination. The presence of numerous other links, many pointing to Shopify domains, indicates a link farm strategy to obscure the true malicious destination. No scripts were extracted from this sample.

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/wb?keyword=mickiewicz%20ballady%20pdf
    • http://vinimom.hezronspringer.uk/uploads/1/3/0/7/130740257/627ffbe.pdf
    • http://files.dsnatural.com/uploads/1/3/2/6/132681308/656548a88e16ff9.pdf
    • http://files.alexannphotography.com/uploads/1/3/0/7/130740323/1686999.pdf
    • http://zinisus.theearnestoptimist.com/uploads/1/3/0/7/130776394/vomilafumagivoxad.pdf
    • http://zotowo.imtiyaazservices.com/uploads/1/3/1/6/131636725/872b4e31.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/goxudupupedosafaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/7414/1864/files/gefadujajebufuzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/welurajobetujivumusinosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9388/5089/files/arminianismo_puro_e_simples.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/9403885320.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/nedaviwiduxukubebalamuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0829/4044/files/7398897255.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/jemitipepoberijugowijoxof.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/86921720264.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/cootie_catcher_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/jilejifudosojariwugot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/31241401449.pdf
    • https://cdn.shopify.com/s/files/1/0440/7338/6136/files/39137141976.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_off00006ea4.bin
678177682cac56f620049cbb2bc41fe01184e331a97a364017803457cb7224d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA4 5328 bytes
font_01_sfnt_off000080f9.bin
ded48b9e5427432c9baeed2ee137162326859d5b50d48161677c2b9a58bb5781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F9 10088 bytes

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