Malicious PDF — malware analysis report

Static analysis result for SHA-256 b320bccb8aa8c083…

MALICIOUS

PDF

38.0 KB Created: 2020-08-29 19:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52235b4b2701e7ce5cd3e69ad54cd64b SHA-1: 9fb3d7315e56ce7731178ffab63aa53cf6330fb4 SHA-256: b320bccb8aa8c083491bc1886bde3945b14725c8bc4b503137f7e1cfb3540b07
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector at 'ttraff.ru'. The document body is heavily obfuscated and appears to be generated content, likely intended to mask the malicious links. The presence of numerous links to external PDFs, many hosted on 'static.usrfiles.com', suggests a SEO poisoning or link farm tactic to obscure the ultimate malicious destination.

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=vocabulary+workshop+level+b+unit+3+t
    • https://static.usrfiles.com/ugd/b8c837_6a4a28552da14ee794c5e4c0b8485d81.pdf
    • https://static.usrfiles.com/ugd/b56239_5cdb6c5f968a43b18b833162198b9c28.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f103243ff8346f791e0928d59f9e370.pdf
    • https://static.usrfiles.com/ugd/b8c837_023fcff311f84dc89e92900234c5be53.pdf
    • https://static.usrfiles.com/ugd/b8c837_8643840dc7034cd780770d12740eeb49.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1eb81697ff347718ec98a3c8ebf3ed8.pdf
    • https://static.usrfiles.com/ugd/73c254_c7a9a1c1c60a485c9700da40d4223f56.pdf
    • https://static.usrfiles.com/ugd/fe83c3_04a185209f1242c7abe9d68139d3d4fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_0725ec1cacfc4d5fa647dcaf7a2bfee7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad78fa24dd2d46dcaa99271bdc585643.pdf
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/25848020988.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/19638701133.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_off000056d9.bin
96036f924d0f9a060d401f5014ff4796f94761caede5d747f56bc85671a07c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D9 5608 bytes
font_01_sfnt_off000069f3.bin
c2a45364805b8fc2d3ac8dbf7c0e792de643c4043b6d178dc1231d2279fc9bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F3 9916 bytes

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