Malicious PDF — malware analysis report

Static analysis result for SHA-256 e805f3f2fb7ab56a…

MALICIOUS

PDF

40.7 KB Created: 2020-08-03 18:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a423c9809106a421a6cd5a0e78d00bca SHA-1: 75f917282465f4744be5b61b1e3761fb09c30670 SHA-256: e805f3f2fb7ab56afe569b6875461e0144c0d3e83478a84ca0b579db6d233422
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body and embedded links suggest a lure related to an 'answer key', designed to trick users into clicking the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify, likely to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=i+have+a+dream+commonlit+answer+key+pdf
    • http://files.fourwallsnoceiling.com/uploads/1/3/1/4/131406258/fupatowul.pdf
    • http://files.chicagosanon.org/uploads/1/3/0/7/130775868/zapinikisusujal-buwokazupepoxaz-zajumeneja-vuxekuma.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.daviscountydoulas.com/uploads/1/3/0/9/130969446/8666630.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/97890470894.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/kozumarividebelaluwofive.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/jogisezumuwalazotelakida.pdf
    • https://cdn.shopify.com/s/files/1/0431/5748/7778/files/51122710334.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/64232609801.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/92837222284.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/dojivokupanomepejasaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/evinrude_owners_manuals_free.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_off00006125.bin
2bc1c942339a8550e022cf4f3efefdef6760a1be70995cdcb08f63a483e1aa6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6125 5652 bytes
font_01_sfnt_off00007451.bin
748da3ca62baca2f5ae0c19c5d8c18d35ea5f43517f5e04a0204a66f4dd4b35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7451 9832 bytes

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