Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd74fca192704431…

MALICIOUS

PDF

53.4 KB Created: 2020-08-19 07:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b98e9963d01452844e97fae248177c92 SHA-1: 7d28d7aac1185670f6ee567a75db54477eed8973 SHA-256: dd74fca1927044319f51704f7b2a5e30f73a871b3a621e764687789f672db3d2
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL https://ttraff.ru/pify?keyword=flow+meter+installation+guide, which is likely intended to deceive the user into clicking it. The presence of numerous PDF links, many hosted on Shopify, suggests a tactic to obscure the malicious destination and leverage seemingly legitimate platforms for distribution.

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=flow+meter+installation+guide
    • http://files.chris-elliott.co.uk/uploads/1/3/0/7/130739871/fakekekovuro.pdf
    • http://files.salasirian.eu/uploads/1/3/1/4/131454899/5687099.pdf
    • http://favesiwud.gracemankato.com/uploads/1/3/1/3/131383363/0c200c83917.pdf
    • http://furadogab.corinnemanning.com/uploads/1/3/0/7/130739017/7a9714cf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5262/2236/files/66139401461.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/apostila_auditor_fiscal_receita_federal_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/wufumituvolupaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/8726/3899/files/dizemaxowevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/pw_atkins_physical_chemistry_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/xosegek.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3863/files/7569425204.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/gepuvezonox.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/github_pages_subdirectory.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/kejipevatajatejujewodit.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_off00009442.bin
399ffd3796bbbfed1c193f9c6449fc676cb57728fabb715b2a8f71312dda0463		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9442 5192 bytes
font_01_sfnt_off0000a5e1.bin
47a8f393998fb636600a731f1f6a64eb78c0ec5cb661cfc208a555d2d03a5663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E1 10220 bytes

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