Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cd5dc3d4fea370…

MALICIOUS

PDF

37.0 KB Created: 2020-08-19 06:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b076803e3fecaaf4e3a9c8fa06fe7d31 SHA-1: a969e4c46663727b06f3f8685eeb2be334dd9331 SHA-256: c1cd5dc3d4fea3706df477acba775c66608a5dce8cea49c9233297b716d22c2f
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as an answer key, to a redirector URL. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body contains the URL 'https://ttraff.com/pify?keyword=polyatomic+ions+worksheet+answer+key+pogil', which is likely used to redirect the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=polyatomic+ions+worksheet+answer+key+pogil
    • http://lodab.iseil.org/uploads/1/3/1/4/131408172/2848995.pdf
    • http://vepuzab.manhattanmentalhealthservices.com/uploads/1/3/2/7/132710621/290e5669d.pdf
    • http://files.mefielding.com/uploads/1/3/0/7/130739951/norikokanoraw.pdf
    • http://files.lifeessencesllc.com/uploads/1/3/0/7/130775368/xujabo_xegotav.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/nafafoximipasofuwud.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/jalisijogiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/85506658721.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/budget_2020_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/31286652213.pdf
    • https://cdn.shopify.com/s/files/1/0455/7878/0837/files/gender_bias_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0431/7462/5437/files/allowances_worksheet_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/55517899773.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5424/files/nanirowezi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1561/7182/files/62107402833.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_off0000532b.bin
edaf3dfca161ff7e18c6ef0f40e3624f2caee9814ffd543b548cf50dd4863824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x532B 5608 bytes
font_01_sfnt_off00006624.bin
9448f2494ab5adb4b13f2546de2e3fb777220c79c0ca87de40049f66122546de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 9676 bytes

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