Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ba3be72dd72a66…

MALICIOUS

PDF

41.5 KB Created: 2020-08-01 02:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cebece0d14880c31a134e0c7255111d SHA-1: 6053f1e799c85978a9a191270ab570e3b2ac2f5f SHA-256: 53ba3be72dd72a66f301f229849b20d2e3eeab063815ca91502e49740c93eb65
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=ninja+forms+pdf. The document body, though heavily obfuscated, contains references to 'Ninja forms pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to download a PDF. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to attract search engine traffic, likely to obscure the malicious redirector.

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=ninja+forms+pdf
    • http://files.mann4edu.org/uploads/1/3/0/7/130739146/6263847.pdf
    • http://files.toledohvacpros.net/uploads/1/3/2/7/132711999/289fa01a.pdf
    • http://files.thoroughbredheritagehorseshow.com/uploads/1/3/0/7/130775027/galesadodularewi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/57002495040.pdf
    • https://cdn.shopify.com/s/files/1/0429/2214/8003/files/24258872312.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/53256469853.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/kotivasekexitiwof.pdf
    • https://cdn.shopify.com/s/files/1/0439/3120/5787/files/vedutekaxexuriwimufoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/20225357292.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/lixejafawenotikidipul.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/70543410579.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/jevesuvuxajidedegafinova.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tukesameb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/93658317455.pdf
    • https://cdn.shopify.com/s/files/1/0429/1277/6351/files/19191549929.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_off000064f1.bin
3a0cbab59985c912cbb293cc55ffb37ab7ed37902c7b875c2f49cd7af21eea4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 5200 bytes
font_01_sfnt_off00007695.bin
9d23f2e8a811e4f09bda63150932ee6f7a1453012c9642f8098a2912fe0b9462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7695 10288 bytes

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