Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8705a9a9a33d7c…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 14:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49c704f5e3e71e6176f1900088682449 SHA-1: 4f2ee485ddd364809f7f643c99efa72f14198bc8 SHA-256: 8b8705a9a9a33d7cd92733a9d6c103ce70d0ec7576a1c46b1a7a98eb52f5ded8
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, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links, https://ttraff.ru/wix?keyword=weather+report+hingham+ma, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the document's purpose is to redirect users to malicious infrastructure.

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=weather+report+hingham+ma
    • https://static.usrfiles.com/ugd/3be3a7_2e6f361993824f76bc630b0e8a0333f8.pdf
    • https://static.usrfiles.com/ugd/d55797_11fb12625ae441ff8c53d80d1cef1ce5.pdf
    • https://static.usrfiles.com/ugd/e02969_40f8d526aed4446bac72e912a543dbb2.pdf
    • https://static.usrfiles.com/ugd/2f8cea_f87c8138197f4c018c2ac8762014e3ca.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/96327823252.pdf
    • https://cdn.shopify.com/s/files/1/0460/9182/9412/files/violin_covers_of_popular_songs_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/wobusosuziletikonazuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/88766356429.pdf
    • https://static.usrfiles.com/ugd/2c8d66_8b44a7bdd7bf48848f7abf72ab8e5121.pdf
    • https://static.usrfiles.com/ugd/ace02d_941e21399b3a4a2599586ec0ec718550.pdf
    • https://static.usrfiles.com/ugd/b8c837_799fc3ec7588419b9818c07b63ee78e6.pdf
    • https://static.usrfiles.com/ugd/6d59ab_7a30462947e74d27aa724b70671bf8d9.pdf
    • https://static.usrfiles.com/ugd/ca32a8_1a9b3e0bdbcc43d4972d732d79bd63ba.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_off00005d74.bin
cfa2fca7a5a2e199a874c1d4a4a810e591fb2f4466ee20e2665cfa8b43edef00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 5036 bytes
font_01_sfnt_off00006e7a.bin
8d0aa6b685b53fe86d7f9491f93bc073210bfabfb7dc9243429ef5dfbd17ed0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7A 9860 bytes

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