Malicious PDF — malware analysis report

Static analysis result for SHA-256 b330a4eb81cb0e47…

MALICIOUS

PDF

35.0 KB Created: 2020-09-03 02:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42dc185494d3cec6ff59c34d8de3212b SHA-1: 56874a39eb156b453cb081e3715bbe5c34b9cab7 SHA-256: b330a4eb81cb0e47dab6456eec3fe5c777cbbf91a62f47eafe5a4af6323a1c53
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, directing users to `https://ttraff.cc/wix?keyword=classroom+rules+and+expectations+template`. The document body, though heavily obfuscated, also contains this URL and appears to be a lure disguised as a template. The file also contains a large number of embedded links to PDFs hosted on Shopify, a common tactic for SEO poisoning or link farming.

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=classroom+rules+and+expectations+template
    • https://cdn.shopify.com/s/files/1/0429/3319/0823/files/ableton_live_para_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/audited_financial_statements_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/71725844239.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/jovusu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4886/7742/files/birthday_new_punjabi_song_video.pdf
    • https://static.usrfiles.com/ugd/b8c837_afc8f188e4a548d1bacb7fcad7aeffd4.pdf
    • https://static.usrfiles.com/ugd/32acb1_ce966e9674394e1bbafb65039249602c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab96afde982e44ff8247b25864394a6b.pdf
    • https://static.usrfiles.com/ugd/41a0b6_1e0d6df823ee488d884d8660ec7cfc26.pdf
    • https://static.usrfiles.com/ugd/30e015_aabe26a790a34c8a93757011a4ab8f97.pdf
    • https://static.usrfiles.com/ugd/dc6899_846bc63e95fb4e4ba6f7eb2c9f8446c8.pdf
    • https://static.usrfiles.com/ugd/0d9a50_d04f5de12db648c487d717d5a6edb3b0.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/gaxumaputova.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/algebraic_expressions_and_identities.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_off00004b9f.bin
f38c49be65de27ecea1039153943f37e81e0c2fe03e5f79b358b8448e24bf64c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9F 5192 bytes
font_01_sfnt_off00005d32.bin
6a55f999f7035a2eb1e15aa2610cabe9ae2c3cdd6a4edd8efcdf8e8063af1d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D32 10004 bytes

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