Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e17dcdc6adff6…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 04:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa26a17005638008c611d92554ff7bc4 SHA-1: e3c726940829febe0b99f1d5b1ca9c2ede008438 SHA-256: 923e17dcdc6adff65a28a8a534c4d962253aa56e439cfabe024ce8ca1e7b36e7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=anabolic+muscle+cooking, which is likely intended to lure the user into clicking through to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wix?keyword=anabolic+muscle+cooking
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/zozojemuzijokuteda.pdf
    • https://cdn.shopify.com/s/files/1/0428/8066/3715/files/wisatemijunofovaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/jamakeguretefefod.pdf
    • https://static.usrfiles.com/ugd/b8c837_22fff65283ac4b1bbd55ff56bd11aa64.pdf
    • https://static.usrfiles.com/ugd/b8c837_340fce7dc4c34671a0311d9b0f02a52b.pdf
    • https://static.usrfiles.com/ugd/b8c837_99a05ef4693a485eabdb5b46b23183fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d18a12e5bf4706bb62bc5982b6810e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60b7bbe2ff24f2da7acd1302e926c3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc2df725d53a4123ae0e48095199d0fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd75f13c0f4448adbdfa0cc5f547db8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ca9ee3b85aa4b28a40204dbd0cb6a60.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e027171820425ba6024ce075f59de4.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_off00007549.bin
40919c4332b10b7cad76fa664cfd940604531e9e8d97476a1f5d3dcbb8286e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7549 5216 bytes
font_01_sfnt_off000086f3.bin
df009905296a697805b2517772dfe21a8a457c2552774f764a82e7640cc4627a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F3 10376 bytes

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