Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2233a8123f93f39…

MALICIOUS

PDF

47.7 KB Created: 2020-08-31 12:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8828e2f638f4e1586097d05bdef44fb SHA-1: 17fdb077ebb28e4cf48dddeec64137fcbf7748a7 SHA-256: f2233a8123f93f3981122a270528d0b5e0a795c13d9d4ea76d88442e4caf7ace
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=cambridge+ielts+10+reading+test+4+pa'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic. The ML classifier strongly supports the malicious nature of this PDF.

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=cambridge+ielts+10+reading+test+4+pa
    • https://static.usrfiles.com/ugd/769f78_82cebe3aeda4435ca6a476c5b9087c6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebc206580f4e41639b32a3acb87238f6.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_e5ca9fbc45974f1c9f40897c14ca63a6.pdf
    • https://static.usrfiles.com/ugd/a91264_74a217b64c534a21936c6f33fc0f5cb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_dce3492ddc904da6843f81230637b7e9.pdf
    • https://cdn.shopify.com/s/files/1/0461/9658/8695/files/android_sdk_folder_macos.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/8998/files/water_pollution_essay_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6527/files/79098044789.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3907/files/57411915014.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/jirumozo.pdf
    • https://cdn.shopify.com/s/files/1/0459/1216/2453/files/mi_app_market_apk.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_off00006f57.bin
18438866250f219b144f8ea9c770182d423bd2d3b60387f0fadbd355211480be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F57 5400 bytes
font_01_sfnt_off0000819c.bin
3c985c24800d8cdb2d654a9d9c93421d19ccf01b5226a419a83f5cd0db4da36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819C 9964 bytes
font_02_sfnt_off0000a3b5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B5 4324 bytes

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