Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fd10170f157248…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 22:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ab5a99f3f4a4d2a74510a684e743d1c SHA-1: d4d3f55a048666869994994ba5cb3eb8d44f2065 SHA-256: a8fd10170f1572480fca21635025ad4457da9fa1ed4ebaa42a1be85698b62ff3
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=registry+unlock+screen+saver'. This URL is presented within the document body, disguised as a prompt for a "Registry unlock screen saver". The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The primary malicious IOC is the ttraff.ru 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.ru/wix?keyword=registry+unlock+screen+saver
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/86033886156.pdf
    • https://cdn.shopify.com/s/files/1/0440/3098/4357/files/fizen.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/71660609940.pdf
    • https://cdn.shopify.com/s/files/1/0433/2411/3049/files/rise_of_the_tomb_raider_launcher_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/12436165290.pdf
    • https://static.usrfiles.com/ugd/b8c837_755704f540af4d7bb0e46674b279632e.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/sonda_vesical_de_demora_e_alivio.pdf
    • https://cdn.shopify.com/s/files/1/0429/1883/8435/files/mupokal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/80273122932.pdf
    • https://static.usrfiles.com/ugd/7ff653_81b5bb2ece434f11b65d08ddc81733e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_66982b67d4c2464abc877d2469cd7e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee79441fcde94d45a23488ab8aedfa4d.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_off00005e55.bin
968b5e45174bd21506f999fcf18e0c0286a80ec2fbe45bb7e7b616a998209553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E55 5200 bytes
font_01_sfnt_off0000702b.bin
82026b7b58b89bb6955941cc39487d71ea2856fde6cfa92bd05a179dc2942bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 15352 bytes

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