Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d522384ce0b75ce…

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 04:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa58f4b834fe60046fe42855ef0f7f4 SHA-1: a4cb93c45f710ae84a7775b2642621a7fa4370be SHA-256: 9d522384ce0b75ceb96f119c5c14af6bb6ae7a6c68623e0a5837f9bdbe20fda1
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, pointing to 'https://ttraff.ru/wix?keyword=audi+a5+recall'. This URL is presented within the document body, disguised as information related to an Audi A5 recall, to entice users to click. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify and static.usrfiles.com domains, likely for SEO manipulation or to host further malicious content.

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.ru/wix?keyword=audi+a5+recall
    • https://cdn.shopify.com/s/files/1/0434/3676/9447/files/hot_rod_american_street_drag_full_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/xobufunepavumizo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/ecommerce_website_templates_free_github.pdf
    • https://static.usrfiles.com/ugd/5ad03d_e380dcd26fdd419ab3c30a27240cf616.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffe5f4d356c04db99c343782e2aaf3dc.pdf
    • https://static.usrfiles.com/ugd/8b9728_c31686089be448a2947747cdb958634d.pdf
    • https://static.usrfiles.com/ugd/e4a001_6d2b1f653f5742849a3d8aee7d60758b.pdf
    • https://static.usrfiles.com/ugd/fbccce_a052c48ba9394b3da8b3e2edbb4b198c.pdf
    • https://static.usrfiles.com/ugd/b52961_f80755978dcd44fda268f1064445c813.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c41bea29aba489cbd092bdc608078f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f488848918cd444ea40602ca62bbc208.pdf
    • https://static.usrfiles.com/ugd/b5aed9_4837594331e04cf39e8ba9aa6f47e739.pdf
    • https://cdn.shopify.com/s/files/1/0432/1771/5361/files/canada_lottery_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/9266/2688/files/vafulexurarotixesijen.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_off000069ca.bin
4b5e83b12249a48451dcdd1402e09ab817eb95c08b1dc1559fdea49036b654b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CA 4868 bytes
font_01_sfnt_off00007a5f.bin
d5295e95014f154ae8edf611694e4f135077258aa3d9ce99a10f5637d4762643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 10868 bytes

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