Malicious PDF — malware analysis report

Static analysis result for SHA-256 45276d1e8bd856da…

MALICIOUS

PDF

34.1 KB Created: 2020-08-30 00:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73cca127ac33e0a10c991a84f1e96ff SHA-1: 0d45a770123a925a6781fa6e1f73fe5ba102dddd SHA-256: 45276d1e8bd856da6aac5bb759e48602054fa6cba8b36d79e42704128359cc31
150 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/wix?keyword=otras+maneras+de+usar+la+boca+pdf. Additionally, it contains a large number of embedded links, identified as a PDF link farm, with many pointing to cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious sites via these embedded links.

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.com/wix?keyword=otras+maneras+de+usar+la+boca+pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/tavogunifet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/lajagefavufu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/10776542896.pdf
    • https://cdn.shopify.com/s/files/1/0437/4183/9514/files/download_50_shades_of_grey.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/cromosomas_y_cariotipo_humano.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/14422699523.pdf
    • https://cdn.shopify.com/s/files/1/0444/0273/7318/files/download_base64_javascript.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ee4b485994e83a8f61d18f6b92ae3.pdf
    • https://static.usrfiles.com/ugd/21e6f2_da2912ace3da4c249e450e0eaf020b83.pdf
    • https://static.usrfiles.com/ugd/b8c837_718bb31baaeb4d43b6c8e52a6d7fb111.pdf
    • https://static.usrfiles.com/ugd/0049ca_7c91ddcf80ba4e6c9b3d2ae4a86a62a7.pdf
    • https://static.usrfiles.com/ugd/5ed537_4930178779084d7cae7b3d0bbff0f36c.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_off000046a8.bin
4076f2caa38d74998600424f8c3633d822cd481fb49bb602b7a4134351fbe3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46A8 5468 bytes
font_01_sfnt_off00005912.bin
7a670ebe32adff8d2a7cbe26da07fb1172fbf9c56862491c2237426f759f2742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5912 10672 bytes

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