Malicious PDF — malware analysis report

Static analysis result for SHA-256 48199c87794a4480…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 01:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82ff51ce579bd788801d35b6931f406b SHA-1: b515ef3adf092acc6ca3f336068234ee44c5f643 SHA-256: 48199c87794a44805062b00ddf9c6c2a75d7c86ed9f2d2d4427f2a8045b6b849
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=korg+a5+manual, which is likely the initial lure. The presence of numerous other links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO poisoning tactic to distribute 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=korg+a5+manual
    • https://static.usrfiles.com/ugd/b8c837_115d4c827926448d96e61df9fdccd4bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_994f6c6b3b334ceca66ad99599072445.pdf
    • https://static.usrfiles.com/ugd/e5a943_60269305decc4cde8b5e5f0e942e8e3e.pdf
    • https://cdn.shopify.com/s/files/1/0461/0218/4100/files/now_or_never_splatoon_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/data_scientist_skills.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4477/files/baccho_ki_kahaniya_karo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/tajutevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/tavujolupidigunogapewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/89465193272.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/84140626115.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_off000053d3.bin
9abe2f737eb8bdc870c376cab752ebf3e8201e9f838e4f3a72484d8aebf8c198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53D3 4920 bytes
font_01_sfnt_off00006480.bin
758269a13845fa5fde8f4f4ea3668d779e92e78abc5ace8e637c66dc1f88dc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 10320 bytes

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