Malicious PDF — malware analysis report

Static analysis result for SHA-256 275a4b56bc1277f5…

MALICIOUS

PDF

54.3 KB Created: 2020-08-22 05:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7905631740f090abac3f92ce8a036d98 SHA-1: a40ad7f96685aad50b773080e79b5bfe823ae1fc SHA-256: 275a4b56bc1277f5a60b8c4a3b93f9b0ae5a71177bea5cc6cedca2e0a6921cca
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. This suggests a phishing or SEO poisoning attack aimed at directing users to malicious sites.

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=free++education+website+templates+in+asp.+net
    • http://files.edhamiltonstudios.com/uploads/1/3/2/8/132814906/kikevesura.pdf
    • http://files.shuckinfun.com/uploads/1/3/2/8/132814387/wawipib_mugonatezebekax_vidanebaz_tagasawasifeji.pdf
    • http://files.texasranchlife.com/uploads/1/3/1/3/131383892/c10d14cf06965.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75904593322.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/fenodeloxujudikobimawa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0858/7933/files/pdf_file_to_jpg_image_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/bamboo_atlassian_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/81481465924.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/10819915434.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/62178267992.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/bezivubufote.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_off00009680.bin
1eeed69996ed86225e351809c72362f4f45240c69d5546f4e7b2d513e36a97d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 5436 bytes
font_01_sfnt_off0000a8ef.bin
c9c8c98479af03c5dff7006f20a486ee13fda0014e3e4795a0a3d32c6343df4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EF 10308 bytes

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