Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b17cb9262ab27a7…

MALICIOUS

PDF

45.5 KB Created: 2020-08-05 09:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a9f7c7d0d58141c191e8a1537656673 SHA-1: 6d9073ac631c6ea60866eb9b9071a11e3f00453f SHA-256: 6b17cb9262ab27a753bcf5805110dbc17e86e6c12e3c0872bcba76be6eca0fa9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=periodic+table+with+element+names+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports 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.com/pify?keyword=periodic+table+with+element+names+pdf
    • http://files.salmonesmotorsport.com/uploads/1/3/0/8/130814408/37f92550f.pdf
    • http://files.robertlloydartny.com/uploads/1/3/1/4/131453365/974a8b07f.pdf
    • http://files.sdyjewellery.com/uploads/1/3/1/4/131408741/265247.pdf
    • http://files.saintecamelle.com/uploads/1/3/1/3/131380687/bc07431a.pdf
    • http://files.internationalleatherbear.com/uploads/1/3/2/6/132682204/2219458.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4042/3592/files/terafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/bikugibakur.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/foxeravifotikolibaven.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/96726536720.pdf
    • https://cdn.shopify.com/s/files/1/0430/5246/6325/files/zuravi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4873/8720/files/wixawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/jimivirasazogugoxururu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8263/files/tumenoxesenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/61189391625.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/livros_sobre_antroposofia.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/vaxuto.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006645.bin
c6adbe552aa091aaebe692ed96d5fccfa79d7dd63824971b8e51c8d1294649e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 5416 bytes
font_01_sfnt_off00007882.bin
5471a9b02e2193fdc3e9955e0f670a095b3638e2185c02247ef391cb98353775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7882 10024 bytes
font_02_sfnt_off00009ad2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD2 4324 bytes

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