Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaf48db487eac1c…

MALICIOUS

PDF

47.8 KB Created: 2020-08-29 15:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b89555dc5ad2de56b61028bd83a4a143 SHA-1: e4081dabb4bd7cf6c04c9670f083e73d34550a9e SHA-256: caaf48db487eac1cbe958ef3c2905676f5169cd8eddfea5590df847d1f5f9634
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to books. The document also features a large number of external PDF links, many hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier 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=peter+lynch+books
    • https://cdn.shopify.com/s/files/1/0466/8892/7908/files/11049674362.pdf
    • https://cdn.shopify.com/s/files/1/0459/2451/5989/files/xudevijezuzifimame.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/59325410645.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/xisujelasov.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/68174052468.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d19a79efe345d0bc8ffa3f4fb0913e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ab9fea6b2844dde98454f9542b0f382.pdf
    • https://static.usrfiles.com/ugd/b8c837_2984490deefa4548872edf3be348ae19.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/welitod.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/4721645547.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_off00006792.bin
7d11130c46cff346db0a11720e1a47b33a79f512fcfe44fbf593a23b9ee28484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6792 4984 bytes
font_01_sfnt_off00007877.bin
08a8b238a910dfa9b33322ce222fb24707c82612cccbbc34fd3e804393900bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 8036 bytes
font_02_sfnt_off00008ee2.bin
00b9957e9f4f5cbfefa4df357f9d9c7a919892fd8470e3423541aac319e55485		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE2 10408 bytes

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