Malicious PDF — malware analysis report

Static analysis result for SHA-256 6277023a72b23a49…

MALICIOUS

PDF

47.7 KB Created: 2020-07-30 03:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5efeec685eea4c9789ad473fbced592 SHA-1: e491f99717fb15bd03aa69f815dbdd18785007e7 SHA-256: 6277023a72b23a49e9f85945c389962b5884edad2de30272b86d033512c2ab03
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, suggests a lure related to a summary of "Baixa idade media". No scripts were extracted, but the presence of a malicious redirector indicates an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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/pify?keyword=baixa+idade+media+resumo+pdf
    • http://files.teach-me-in-autism.com/uploads/1/3/2/6/132682681/wepufo.pdf
    • http://files.lavarthomas.com/uploads/1/3/0/7/130740213/96f5d44e.pdf
    • http://files.crystalclearcommunications.co.uk/uploads/1/3/0/7/130740202/38b574ef0e7.pdf
    • http://files.wattssashiko.com/uploads/1/3/0/8/130874493/2505733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3767/0041/files/77012466482.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/winubivapepojutizevet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/kukar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0426/3580/files/nugegapivazoregizubo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/18198457690.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3469/files/sugademasenomarituxefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/56793044047.pdf
    • https://cdn.shopify.com/s/files/1/0437/1297/0903/files/30821029681.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/53606897772.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/36866196574.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_off0000790b.bin
dd4fb2f0993fb67ed27cfdac7f5cbbe22fb13a006a32adef1f5ce4cdc8a1e301		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 4968 bytes
font_01_sfnt_off000089f5.bin
4ba962e845152c3b87d7c29e17ed23f9d9995772482218ba9ceda6af904196cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F5 12688 bytes

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