Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0f46c9e955f41d…

MALICIOUS

PDF

51.7 KB Created: 2020-08-30 22:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44bc3ed9d4dcc73d737f219ad76793d6 SHA-1: 1788afdb08301f61816e3d74faf0b0687f15672b SHA-256: 4a0f46c9e955f41da15265a48af0306e4dc078b48f2530f6647ee043d0eed708
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=stepwells+reading+ielts+mentor'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on static.usrfiles.com and cdn.shopify.com, suggesting a link farm or SEO poisoning attempt. The primary intent appears to be directing the user to the malicious redirector.

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/wix?keyword=stepwells+reading+ielts+mentor
    • https://static.usrfiles.com/ugd/d775a9_5d77e75e55a84cefa277ab9e3e9cc0ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_46a560164ed24750b3b965e884e7aac6.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d00bb687ca4e67b4ae52a38c2d35ef.pdf
    • https://static.usrfiles.com/ugd/2f8cea_1983777cc5304fa4ae4668b743159443.pdf
    • https://static.usrfiles.com/ugd/b8c837_41f77f6964174f279e88c00b328106d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f3e1cbf8447b7ab0616285f8b1dff.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/55408697615.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/lotobab.pdf
    • https://cdn.shopify.com/s/files/1/0446/1186/2691/files/teratileteboninokaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/4378/1788/files/best_design_for_powerpoint_presentations.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/wimogiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3725/9936/files/nodepedesizazibilujigudo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4511/0438/files/tidopowalus.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_off00008be7.bin
016036833f49a1b89da408f924037f9f9711c64c6fd09618f060ebe235bad715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE7 5472 bytes
font_01_sfnt_off00009e7c.bin
82468487e130d17d4a6b4ff6c6105fe24110a560a706d8bd2c3b0027695b601f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E7C 10388 bytes

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