Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfdf18eee9b938e…

MALICIOUS

PDF

51.8 KB Created: 2020-09-07 22:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b24fbb159638b23393e78726892a231e SHA-1: 733978f3e7e52f03ad26607d42e4f7833cb94644 SHA-256: 8bfdf18eee9b938eb2a736789febb53dfffa23bc170f76ae6acb6136680ec1fb
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL designed to appear as a workbook but redirects to a malicious site. The PDF also contains a large number of external links, characteristic of SEO spam or link farms, further indicating a malicious intent to drive traffic to potentially harmful destinations.

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.me/wix?keyword=reading+comprehension+grade+3+workbook+pdf
    • https://cdn.shopify.com/s/files/1/0463/1409/4754/files/piruba.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/ecommerce_website_development_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/junokakiroxu.pdf
    • https://cdn.shopify.com/s/files/1/0460/8691/4212/files/vodofuvufojitaxibire.pdf
    • https://cdn.shopify.com/s/files/1/0460/8809/3860/files/zajowixajenikirekemezokud.pdf
    • https://static.usrfiles.com/ugd/1e533a_2bef95ae4aa949f48043cd67c0155027.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/fortnightly_timesheet_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/zowawisamijesala.pdf
    • https://cdn.shopify.com/s/files/1/0462/8162/1664/files/5534538402.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/bifosemidobexiwotababi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5415/3371/files/the_anatomy_of_greatness.pdf
    • https://cdn.shopify.com/s/files/1/0460/8743/8500/files/matubiburoduvikizuji.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/sowalopudidasorexokatak.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0823/files/44130786418.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/18096608471.pdf
    • https://cdn.shopify.com/s/files/1/0429/6146/9599/files/79285966310.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_off000089fc.bin
3d5dd87852770c0408e991c995c99a7570c619d26b9e19729f7d2c078f1834bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FC 6004 bytes
font_01_sfnt_off00009e5c.bin
5f1710b134221ebdb4e3a6e0c0e35acabeff33f22a7b70a6f54346ce4cb4adba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5C 10292 bytes

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