Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d04f098f224bcd…

MALICIOUS

PDF

44.0 KB Created: 2020-09-12 00:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a402423f1091a3ce772ab51236851f76 SHA-1: ae392b5d1177342cf37a7b034ce106b53d64e367 SHA-256: 19d04f098f224bcdb36c9f6a961af1a451726f1770a92e85c310ff33951ddebb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.me/wix?keyword=flame+emission+spectroscopy+lab+report, is likely used to lure victims. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on static.usrfiles.com, which are part of the link farm. 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.me/wix?keyword=flame+emission+spectroscopy+lab+report
    • https://static.usrfiles.com/ugd/cbe7f7_58959e0f277946e0a3bb58862e2be4a5.pdf
    • https://static.usrfiles.com/ugd/0c60a0_0aef581b91e64e798814817231e82132.pdf
    • https://static.usrfiles.com/ugd/90423f_efdcab656c00480f995102562c33d029.pdf
    • https://static.usrfiles.com/ugd/07e02c_46e8a954bc0944c5b3810dd9785dc25c.pdf
    • https://cdn.shopify.com/s/files/1/0437/2614/3639/files/27850808446.pdf
    • https://cdn.shopify.com/s/files/1/0438/8365/9419/files/90808880132.pdf
    • https://static.usrfiles.com/ugd/a421e3_a6856db6c014439b8f07c1138c3b40ee.pdf
    • https://static.usrfiles.com/ugd/7f16bd_a87daac0a2ef429182a21fc922198188.pdf
    • https://static.usrfiles.com/ugd/0dd040_d434988a3f814505831eb8e34280b7e7.pdf
    • https://static.usrfiles.com/ugd/54b9a1_45313c385d4d4a6e8a3852288aafb576.pdf
    • https://static.usrfiles.com/ugd/23924c_ffe14b6b24234e71bdde02aa4708253b.pdf
    • https://static.usrfiles.com/ugd/ac8c68_c2b849d1e25b4ba4955ed8f1ae5317af.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_off00006cf7.bin
6f185881aa509a9b370dc434cf94d733a3323fba3aeae82ddf9353e8123a85a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF7 5276 bytes
font_01_sfnt_off00007ede.bin
ae66ea9970c028a769a7f6c7faef4768487cccb2e9ea51baa0c3be6593eba32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDE 10836 bytes

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