Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22aa1f84558fd24…

MALICIOUS

PDF

45.1 KB Created: 2020-07-28 13:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1f40a8e5e1c1c5c5ea3632041bfb0a0 SHA-1: 1fc2e79b582166ef080d0d4bcf6e88c886398995 SHA-256: a22aa1f84558fd24a504c6e4b9da4b84935a3c5683cd6ed8b714f2b7d5715073
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/pify?keyword=double+final+consonant+rule+worksheets', is flagged as a malicious redirector. The document body is heavily obfuscated and likely contains further obfuscated links or content designed to deceive the user into clicking the malicious URLs.

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.ru/pify?keyword=double+final+consonant+rule+worksheets
    • http://files.tangostuffnyc.com/uploads/1/3/1/8/131857152/5ff50.pdf
    • http://files.samsrealty.com/uploads/1/3/0/7/130738991/xorusepu.pdf
    • http://files.julliaraephotography.com/uploads/1/3/1/8/131856626/nikupisoguzafevebera.pdf
    • http://files.nancytangles.com/uploads/1/3/0/7/130740480/lazenumigulub_wusemizigiduzi_bulafikozomat_webudob.pdf
    • http://files.acadianaplumbersassociation.com/uploads/1/3/2/7/132710601/patemoxew-zewiwepogasose-nokaz-pawivemobim.pdf
    • http://files.nancytangles.com/uploads/1/3/0/7/130740480/laze
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/36485477297.pdf
    • https://cdn.shopify.com/s/files/1/0430/8071/2343/files/jawepenigusexutoxolijix.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/15320546916.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48787523288.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6016/files/70946378158.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/57676027510.pdf
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/wimonubowifevita.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/zezebozukogofituvagofuni.pdf
    • https://cdn.shopify.com/s/files/1/0441/0834/9592/files/nofepugegi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9352/2587/files/donanejubaxinexadiraxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/57614975157.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/zafixunuko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/82483011388.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/voniladus.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_off00006d42.bin
2ce03b0c833f8219228416799a0969d1ed37f4c8fe6086d50cba3f2ebfe10ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D42 5144 bytes
font_01_sfnt_off00007ed3.bin
05c909a774d9282232f636de7d7372e6f5fb5fb5f5af97bd04857527e2ed0030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED3 12564 bytes

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