Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8932b6773dcab…

MALICIOUS

PDF

37.1 KB Created: 2020-08-30 23:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 725a32afa1dc03c8fa7c3218fe10781a SHA-1: 68df84688e9b876e0c738cabdf6a656e64742e76 SHA-256: b1b8932b6773dcab8f8043d75d84ae2e0697f2e84b5c04a0642d26d38036e118
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 domain identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be related to academic theories, likely serving as a lure. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

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=theories+for+direct+social+work+practice
    • https://static.usrfiles.com/ugd/3b7182_36d76c1da1614118a55f0d4590c67f4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f0e8922dfd942efa2013882555d4d27.pdf
    • https://static.usrfiles.com/ugd/63d3ad_235a8c75451a4502aa895cc8ae534bf3.pdf
    • https://static.usrfiles.com/ugd/cafc24_ff16a3f63e104f148ac70536ac39834b.pdf
    • https://static.usrfiles.com/ugd/6da380_9f307728ba0f47dca6e17c6ee988e121.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d5d119bc1b45deaae62c4b49be2046.pdf
    • https://static.usrfiles.com/ugd/b8c837_24aea0c63e874923a51c64b47926ef78.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dec5066c5b74e60b54c8eea77a3ec30.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/72959191452.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/ejercicios_resueltos_de_arquitectura_de_computadoras.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/49145473123.pdf
    • https://cdn.shopify.com/s/files/1/0448/1341/8662/files/prinsip_kerja_sling_psychrometer.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/93540268801.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/33634704554.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/39130096804.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046b4.bin
791696b2dcd0c7de6b65355de619a10ad60c2b3824787af0c7ed53f0a363b4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46B4 5032 bytes
font_01_sfnt_off000057f2.bin
4eb0ebb505bbd2102a98437bdff0a21c975b2b00c35bcf7838c6828d8ac21816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F2 9796 bytes
font_02_sfnt_off00007975.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 4324 bytes

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