Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b87e42b2a31775f…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 02:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a77b114c42c41d6a3e96513b742b33c8 SHA-1: 797aced43b265de99ee922a9e4e25aad93d2af2c SHA-256: 8b87e42b2a31775fdfec18b23a9bdb0645226810a117d7853fc1b7d423cc746f
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/pify?keyword=hybridization+of+co2+pdf. The document body is heavily obfuscated and contains many of the extracted URLs, suggesting a lure to external content.

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.com/pify?keyword=hybridization+of+co2+pdf
    • http://files.seafieldfarmva.com/uploads/1/3/0/8/130814078/38b4a5431b0.pdf
    • http://files.crossharmony.com/uploads/1/3/1/4/131453648/e192330ba6d7c65.pdf
    • http://files.readmoredaily.com/uploads/1/3/1/3/131397981/gujukisukobe-tegapez-nafekipozin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1458/files/32371568695.pdf
    • https://cdn.shopify.com/s/files/1/0433/5065/5129/files/viputizudowate.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/goldoni_la_bottega_del_caff.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/wupesapizelowe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7310/0184/files/sikadexewijojemefiwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/40553532515.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/vesatuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/raxaxiwitijadiwanad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/recursive_pascal_trianle.pdf
    • https://cdn.shopify.com/s/files/1/0439/1459/2408/files/zazuvibafibosiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/possessive_pronouns_worksheets_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/komatsu_parts_book.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_off000063a9.bin
60d46d7a7ebad3d037cd234fedc3a6bf083c97f51925c14fe1c5cdb653d26fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 5324 bytes
font_01_sfnt_off000075dd.bin
a9ba34f52786f7b2a3d691c71c40beae740e175076f77584e46b5199001d0444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 10676 bytes

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