Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72201ec1dd594b6…

MALICIOUS

PDF

48.7 KB Created: 2020-08-29 03:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c121c6fa80b0e9c5efde8cec1e80c5d9 SHA-1: daa330d85a7dde118942184446fdebfc8c55363b SHA-256: c72201ec1dd594b65c9bd9275c2b09cba0a9c83f83819a6951c64049a9db9888
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=dragon+casualty+background+5e'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding a large number of external links, with the first identified as 'https://static.usrfiles.com/ugd/b8c837_72ac00d833ba4b14b2a37e71ec36f944.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and numerous other PDF links, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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=dragon+casualty+background+5e
    • https://static.usrfiles.com/ugd/b8c837_72ac00d833ba4b14b2a37e71ec36f944.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c2ee0dedd6a448a91324ba382142939.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f82b275dd6647108942db68a6ada06e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c8f8a7b44464f87a491fe47aa1ed692.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1d7f7b7a9fa4410bb39b8d6906269d2.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/97908396556.pdf
    • https://cdn.shopify.com/s/files/1/0461/6408/2851/files/carcinoma_of_tongue_case_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/al_quran_dan_terjemahan_bahasa_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0432/1797/7504/files/fegifaxabetawij.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7243/files/madatomugezebesejore.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/controle_caf_hebergement_titre_gratu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/acrobat_standard_dc_edit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1081/8201/files/laundry_symbols_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/kexovejidaropomifinitaj.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ad2c6d186d241708bee8ee9f35fc233.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f72e0e0602e47d79c0122bc21420125.pdf
    • https://static.usrfiles.com/ugd/b8c837_77bc6dec948540dc8be5515f749ffefa.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_off000072bd.bin
0718043400e10b923acbdfbf2c9de07a56856c578d5df8522ce334b95cfd1f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 5368 bytes
font_01_sfnt_off00008513.bin
82ce4a3a619c741ba0702c04693e759a76a6de5341c93afd9667ee0618152339		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8513 10124 bytes
font_02_sfnt_off0000a7b2.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B2 4324 bytes

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