Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a7fec683d93a74…

MALICIOUS

PDF

48.3 KB Created: 2020-09-02 18:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850f9714f86c6166a98f8969494614f1 SHA-1: 057606143600ff63aba3de018b5e922b7b466132 SHA-256: c4a7fec683d93a74f018772024bee84573435a482b9d3a2c37057746637a6dfc
120 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=hannah+arendt+on+revolution+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and other links to PDF files hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The primary attack pattern involves luring the user to a malicious site via a seemingly relevant document.

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/wix?keyword=hannah+arendt+on+revolution+pdf
    • https://static.usrfiles.com/ugd/b8c837_1c9c9cb729df4c818de01045768e1714.pdf
    • https://static.usrfiles.com/ugd/78daac_9a0f6f3f86674ae9b0d03464c84933e3.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_abb17c411d924be79f716bdd06bc7057.pdf
    • https://static.usrfiles.com/ugd/87b9a8_1a97fdfd60f543669c44ecc7b4b9f19c.pdf
    • https://static.usrfiles.com/ugd/b8c837_18b4dcb7af6a4cc18f8d0f2ff2453413.pdf
    • https://static.usrfiles.com/ugd/6f58fb_8fae87ddb93a48259854656dc4c9aa44.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f066c0bc46c47048f988b9d4575c723.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7543a49c0ef427ab294ad4b80b9a20b.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/woten.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/tritton_usb_2._0_vga_adapter_driver.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/dusafufarozisumam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/edtpa_special_education_templates.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6184/files/46454897166.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/vinovibupamugog.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_off00008130.bin
a705b97d44566c4cf08d1c36ff63a3c917a46d0b6ee50415760f5c36903631a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8130 4972 bytes
font_01_sfnt_off0000921d.bin
28b97828c190a017511c84c94e29b8920b39fb7114436c17ddd20c1924a33527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x921D 9976 bytes

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