Malicious PDF — malware analysis report

Static analysis result for SHA-256 387b3e0d7500dc2c…

MALICIOUS

PDF

39.8 KB Created: 2020-09-02 06:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201a21ce1a6f0004c317622dfab1cea4 SHA-1: ba4ca9e390e8d753a0b579c731767095e3b48e69 SHA-256: 387b3e0d7500dc2c9877fd6d7c105b2ec360725aa2461b7d88297d58032ea4bc
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=dos+boot+usb+iso', which is also flagged as malicious. Another heuristic indicates a large number of external PDF links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' lure further supports a phishing or redirection attempt.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=dos+boot+usb+iso
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/mental_health_counselor_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/kdigo_guidelines_for_iga_nephropathy.pdf
    • https://cdn.shopify.com/s/files/1/0447/0875/7660/files/wujarisul.pdf
    • https://cdn.shopify.com/s/files/1/0430/3106/8823/files/65055391910.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/xewuroderalosapazemiluba.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6750/files/problem_solving_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd7e42400f047ffa3d5c9abb00ab8b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9611631e2c47a1bae29aa0f52696d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5af6dc5364c24ce1a528da0d279820a9.pdf
    • https://static.usrfiles.com/ugd/c0a468_28d1bd386e4c4231a24f10bf9c53b5f9.pdf
    • https://static.usrfiles.com/ugd/913720_ab10d3215cd84f2d842f4bd6fbcf491e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0f6d74d10bc47bdb90ccbb503061549.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_off00006055.bin
78d0ebaf7d24a9fc6b875b1a5458243f4b09c869381a05f37902b0dcb682b828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6055 4480 bytes
font_01_sfnt_off00006faa.bin
c92eec7b93ea3e10f8d146b35e16762488da2349bc6edab48eef042aeadd42f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAA 10324 bytes

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