Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31d3cacbd759c82…

MALICIOUS

PDF

41.9 KB Created: 2020-08-05 05:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86c59f9631e3bd8999bbc0db667f97b7 SHA-1: 3c5e555582bb5e144ea3ebe0e6b00a5bc0c3eff8 SHA-256: d31d3cacbd759c8242a03c0726509226782ad42137bb88dd2d11efd35e12337b
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs but one critical link to a known malicious redirector at ttraff.com. This indicates a social engineering attempt to direct users to malicious content under the guise of educational worksheets. No scripts were extracted from this sample.

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=beginning+letter+sounds+cut+and+paste+worksheets+pdf
    • http://files.adornkids.com/uploads/1/3/1/8/131856068/9648078e1ec.pdf
    • http://files.janaheartsdesign.com/uploads/1/3/0/8/130813095/dezup-zetafejum-filakaxajotux.pdf
    • http://fivuvat.nicoleguimaraes.com/uploads/1/3/1/3/131379012/1085009.pdf
    • http://nogapil.jmcgaw.com/uploads/1/3/1/6/131636725/9863421.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/78307163414.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/nujevaduwosuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/91742327675.pdf
    • https://cdn.shopify.com/s/files/1/0437/5193/2056/files/xabevidu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/vibisopexozezalemaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/38423987453.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/gorozeburolurifex.pdf
    • https://cdn.shopify.com/s/files/1/0435/6522/0003/files/87219415034.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/wellston_forum_topix.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/36033725561.pdf
    • https://cdn.shopify.com/s/files/1/0434/0845/7877/files/75784020047.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/82449718267.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.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_off00006430.bin
f8c3ce8fe4103a8d2fef9d9328a3a1fad76ae4668b721fe4acafda240be59b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6430 5624 bytes
font_01_sfnt_off00007767.bin
30edd543206a49f238418166c6e935e0f0578dcc4f7692fbcc7fdbc2ee519632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7767 10192 bytes

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