Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb4043ef74241e3…

MALICIOUS

PDF

62.8 KB Created: 2020-09-01 17:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2e84486a57fe61887a1dc155a41150a SHA-1: 708a977046897cb2866605159c26fb0fcc536f8f SHA-256: bbb4043ef74241e31d4ee847fb3292e1a91521725c04c762a3a625b5c7625678
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=antonin+artaud+poemas+pdf'. This link is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious.

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.link/wix?keyword=antonin+artaud+poemas+pdf
    • https://static.usrfiles.com/ugd/bf07b1_92f1d2c32b4f4b1aa5ddd90d5dbd24d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_82286ee8293442c8a336b04116693c48.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1e595c142fe4d1aa22bfba95c315d95.pdf
    • https://static.usrfiles.com/ugd/4c7633_62abe409a77b47cf98e6c4c99b735394.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/sentence_and_sentence_fragment_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/58539503383.pdf
    • https://static.usrfiles.com/ugd/fedf23_79d661b874ef4ded9e277581bf8f2a22.pdf
    • https://static.usrfiles.com/ugd/9cc572_871713ef0c0a4dd3af9d8b9c2104a82c.pdf
    • https://static.usrfiles.com/ugd/2b25e8_d278ca47b13d4e14a7d04d8a1e37ac21.pdf
    • https://static.usrfiles.com/ugd/67f5f7_f000730becb548288912adc8456b04aa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/25554490704.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2359/files/70907028062.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_off0000ba18.bin
462b26bcd24b25afea48960ec457fd5d407e925641b7da7b12cdeb38ae19f1b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA18 5144 bytes
font_01_sfnt_off0000cb80.bin
dfbf24167b8370bee6d373267359ea5eb372c465a7961ccc686e5dd5a8bfb841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB80 10260 bytes

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