Malicious PDF — malware analysis report

Static analysis result for SHA-256 3557f84d415f6434…

MALICIOUS

PDF

46.1 KB Created: 2020-08-04 14:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50822ca2aaeb5824e1ea582babe2f0f5 SHA-1: 6efd742db356f1498b9b402401c9a22676d43078 SHA-256: 3557f84d415f643459611433378cf9d667ab5a4a6a7b71aa124a8e1315e4a995
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. This is indicative of a link farm, likely used for SEO poisoning or to distribute malicious content. One critical heuristic firing confirms the presence of a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=rachmaninoff+vespers+pdf', which is designed to redirect users to potentially harmful sites. No scripts were extracted, limiting the analysis of direct payload execution.

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=rachmaninoff+vespers+pdf
    • http://files.graindesigns.co.uk/uploads/1/3/1/0/131070109/4591ff3fe1336.pdf
    • http://bukaf.napervillepaintingandepoxyflooring.com/uploads/1/3/0/7/130776499/jinewejuziwiga.pdf
    • http://files.fashionxpress.net/uploads/1/3/1/8/131871817/4f5a3.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/free_windows_7_product_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3934/files/50440184241.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/26049939406.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/vawuvetoganusawenivekoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/vujinusuzenobikedamumem.pdf
    • https://cdn.shopify.com/s/files/1/0432/6319/7337/files/64934191761.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/ar_15_assembly.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/fidoxuwovasavibonex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/zarekubimifidosi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2883/0625/files/93012521215.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/taziruvefonigujelovofuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/46013147444.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_off0000749b.bin
4f9afc8daa278916c581aa27a07368a17fb7c941e6d30180e859d7c6e12c03be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x749B 5432 bytes
font_01_sfnt_off000086f6.bin
505f59fe0bb37b2623c63215ac90e8f35753a92c8ecd1f1c30f45a36a1acc426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F6 10760 bytes

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