Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9263da898298da…

MALICIOUS

PDF

44.0 KB Created: 2020-08-21 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ecb3b8ec9d8653fe398a4f6311efb2c SHA-1: db4d3dfdc4a96312f8b92002eb940306a8a5792b SHA-256: 8d9263da898298da051e7183db3c7e8da09596103e43f84dc4065ae0f5046048
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=simple+algebraic+equations+worksheet'. This URL is likely part of a phishing or scam campaign designed to lure users to malicious content. The document also contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm used for SEO poisoning or distributing malicious payloads. 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=simple+algebraic+equations+worksheet
    • http://files.noetikexpression.org/uploads/1/3/0/7/130776200/672b124fde.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/19218958992.pdf
    • https://cdn.shopify.com/s/files/1/0454/3774/7350/files/59393480880.pdf
    • https://cdn.shopify.com/s/files/1/0430/8326/8263/files/waxofivofovaladanurogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3140/files/53944339394.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/zafal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6293/5200/files/polyarteritis_nodosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/fakunenugatawujudodujogo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0034/6270/files/applied_mathematics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/56332428443.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/18843943243.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/10th_social_science_book_english_medium_in_download.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_off00006c43.bin
b6b86cab23947551577610d9730b9ea8f8adf48202a8f25a931d62d23ef1fb3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C43 5872 bytes
font_01_sfnt_off00008016.bin
1a9646a1ac95019154584cca4810b4027646ee371d3c35569ae71a7fc6b3b7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8016 10340 bytes

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