Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cbeb0a9b0d5ec5…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 00:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c8730e05cc273a7a45a4e2eab216f7 SHA-1: b1ced04c1a972aab68ff8416bd6c3eab58272ac8 SHA-256: e1cbeb0a9b0d5ec5f42391385d22863b41d16ff08a644ce8b4e70c51168e457b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, characteristic of a link farm. One of these links, 'https://ttraff.ru/wix?keyword=xcom+2+wotc+tech+tree', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of the malicious URL is the primary indicator of compromise.

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.ru/wix?keyword=xcom+2+wotc+tech+tree
    • https://static.usrfiles.com/ugd/934fc3_9deaf9c4306b44fea0fc71ba36a0d9dc.pdf
    • https://static.usrfiles.com/ugd/8127dd_d1d45d5794754ae3b62b5f6ca0778f65.pdf
    • https://static.usrfiles.com/ugd/d4da64_de486ec3f63a45a3af1a6a082885cd9e.pdf
    • https://static.usrfiles.com/ugd/d63aaf_3253ab482e55466a89b782921f0600af.pdf
    • https://cdn.shopify.com/s/files/1/0437/0078/1208/files/nogidiso.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0815/files/kewowanegifuvosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/98282561683.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/41666277743.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5770c939a3345329611b70808e26100.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6354e190b664a148bc5c68eb631d4ac.pdf
    • https://static.usrfiles.com/ugd/83f04e_868d412797e94819b83353668322995c.pdf
    • https://static.usrfiles.com/ugd/77d535_8bbb81908e34419088586fa68503b71e.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_off000061c8.bin
2d4a41360a341137e8335b055f0d1f4208755eb8ddfc97830895b10e52d7e419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C8 4820 bytes
font_01_sfnt_off00007211.bin
8ff872da9952562118a91dd42a36d0fc43ebbf58d80a2baf13db4290c4784e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7211 10312 bytes

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