Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a025fa86a25e57c…

MALICIOUS

PDF

33.3 KB Created: 2020-08-18 22:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c409ff35c475440e040cea3a0733f9c5 SHA-1: 0220362990176268c675d3c75b5932889daa7bcd SHA-256: 3a025fa86a25e57cf1decd60b300a8496be19a64715044dfe5aed2202b56e078
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'Algebra 1 chapter 3 quiz answers'. This link, https://ttraff.cc/pify?keyword=algebra+1+chapter+3+quiz+answers, leads to known malicious infrastructure. The document also hosts a large number of external PDF links, many hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the final malicious destination. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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.cc/pify?keyword=algebra+1+chapter+3+quiz+answers
    • http://files.lovepositivecounseling.com/uploads/1/3/0/7/130775756/tavivirozizatidi.pdf
    • http://mizesifa.lifootcarepc.com/uploads/1/3/1/6/131607131/48c52a9b356fd9d.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/xibakaxefugug.pdf
    • https://cdn.shopify.com/s/files/1/0434/5574/2114/files/kigumarimofikijatexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/97221000606.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/vukulosuzepobitet.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/jegifajupawotalati.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/xopujosuwumaxirowakab.pdf
    • https://cdn.shopify.com/s/files/1/0432/4402/8059/files/5509970969.pdf
    • https://cdn.shopify.com/s/files/1/0433/2129/5003/files/wijedinunobeza.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/44377754481.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5691/files/65741003910.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_off0000423a.bin
5978a938e223775d6161f1d18302e3261f211c8be5888f4dcd0dae2a1dcc6b97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x423A 5808 bytes
font_01_sfnt_off00005615.bin
ee0e26571f4ad07c564a4473762102c1a735a825710513154eefdd9b8604a373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5615 10184 bytes

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