Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9327f53f1f518f…

MALICIOUS

PDF

49.7 KB Created: 2020-09-01 16:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03617492b31d7543a2c172be2f6d4809 SHA-1: 69b255144b524c0e7932d009b4b3448b8fe78519 SHA-256: 1a9327f53f1f518fe3eaea3d935ad0d3f796387ec5ef0b6249a2daac9e0c323b
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a link farm. The embedded URL points to 'ttraff.ru', a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, indicating it is the primary lure. 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.ru/wix?keyword=free+will+template+state+of+texas
    • https://static.usrfiles.com/ugd/b8c837_8af242500e944e1386a1ccb6cee31993.pdf
    • https://static.usrfiles.com/ugd/b8c837_051ad0a2673f4287b6d7440a6db212f2.pdf
    • https://static.usrfiles.com/ugd/cb4a18_cadf870a238c430f9f419e9bb67948a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dd1d581fa7e47719c9a1f79b245599e.pdf
    • https://static.usrfiles.com/ugd/f55bec_6f5dbdaa8dcd4075bd62fb0f56b89009.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/91027133719.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/lean_muscle_building_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4743/files/toxokefebawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/beneteau_oceanis_41._1_performance.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/76065689236.pdf
    • https://cdn.shopify.com/s/files/1/0428/1715/9335/files/davamumogewudubajuxumaj.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_off0000856a.bin
0f671860f411b0903df54e8bb8f62be0e64b69078f2c40c9e696487b233b67fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856A 5160 bytes
font_01_sfnt_off000096fa.bin
7fb4470d812b0008784ebe4c2ea62eb6c49e1a114202c31a07aa158ad1724e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96FA 10244 bytes

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