Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fafe76bba81f2b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-16 14:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b766c0ff6c5ee6301eaea8b465fb4a4d SHA-1: df69dea2fac56feaa3282fdc6e9fad7fb5022980 SHA-256: 24fafe76bba81f2bc774b63b187d1ab50b6e6dd2c50a28c4330b1d9d7355454b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=american+short+stories+anthology+pdf'. This URL is part of a link farm designed to attract traffic. The document body, though heavily obfuscated, contains the same URL and references to 'American short stories anthology pdf', suggesting a lure to disguise malicious intent. The presence of numerous embedded URLs, many hosted on Shopify, further supports the link farm heuristic. The ML classifier also 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.com/pify?keyword=american+short+stories+anthology+pdf
    • http://files.paulshishkoffjr.com/uploads/1/3/0/8/130873932/c88e20e8db686d.pdf
    • http://files.scubabob.org/uploads/1/3/0/8/130814430/1c5c3.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/25749035333.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/33928018278.pdf
    • https://cdn.shopify.com/s/files/1/0437/2060/5850/files/80960702469.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8526/files/damarerotuxokaxoniruk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/99878982923.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1265/files/ninod.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3655/files/70391457562.pdf
    • https://cdn.shopify.com/s/files/1/0431/6387/7537/files/fifuzexafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/61548333966.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/comment_assembler_deux_sur_mac.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3408/files/59769129658.pdf
    • https://cdn.shopify.com/s/files/1/0431/6479/5046/files/36982901734.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/93503633511.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_off00006790.bin
c6b9099be09c6f30af1cd72fdab11c86efec70a29249e093d59ac02e341323be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6790 5660 bytes
font_01_sfnt_off00007aa1.bin
d9975b6b8cde638519a395f3170ead93d3bf650a7899a293499b15fe213a5331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA1 10124 bytes

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