Malicious PDF — malware analysis report

Static analysis result for SHA-256 9997d0835a6746e0…

MALICIOUS

PDF

41.4 KB Created: 2020-09-03 22:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad33dd907aad7e4c9c21cefdb589f2f0 SHA-1: 6a61770025d38e782c047153853a313124bd6cb7 SHA-256: 9997d0835a6746e09e2b7eac6a40dc48ffa7c3b9e3e7aeddd047b2115ae60598
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.me. The document body, though heavily obfuscated, contains the URL for the malicious redirector and the title "Cert of origin form ai", suggesting a lure to trick the user into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=cert+of+origin+form+ai
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/sofisifes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/vokisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7305/2575/files/abbreviations_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0888/files/pubadezusubasirano.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6083/files/sogutabaxewukasoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/47340669127.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1185/files/52899273497.pdf
    • https://static.usrfiles.com/ugd/defcb2_00ecde65ddfd4794afa88df49c7a44fc.pdf
    • https://static.usrfiles.com/ugd/0a0016_49c07e30b3fc476895327aa89f4313ce.pdf
    • https://static.usrfiles.com/ugd/738632_c492bc5ceae049aeb5f7bcb053b73065.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b8d0798de2a4789a4b0b27ac73622b5.pdf
    • https://static.usrfiles.com/ugd/1f6d71_66add78333164b4ab1cfd5fe0148e2b3.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_off000066b2.bin
8e59298a3499b7a7c40b7203f0dcc21b41c4ae40e435d23da5e7aa209b9a1679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B2 4784 bytes
font_01_sfnt_off000076e0.bin
b4aba779f9f6c76607d38c06dab73e7d5ed389bba1552472f4ffe1ce25b21630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E0 9948 bytes

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