Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf59b8544e3e6f4f…

MALICIOUS

PDF

53.9 KB Created: 2020-08-18 16:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 788cff3b772b46965da3de2f8cb9f364 SHA-1: 2d369e802b287c23db187854fec11126b0271670 SHA-256: bf59b8544e3e6f4f85f6d4d8555be940c8694059ac0e990a3f0dd73f250c33bd
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.cc/pify?keyword=adpcm+file+format'. This suggests the document is designed to lure users into clicking these links, potentially leading to further compromise. The presence of a link farm and a malicious redirector indicates a social engineering attack aimed at driving traffic to malicious infrastructure.

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=adpcm+file+format
    • http://zejukusi.weddingplansnicosia.com/uploads/1/3/1/1/131164250/2954888.pdf
    • http://files.anglemidwest.com/uploads/1/3/2/8/132815019/80a593a.pdf
    • http://files.alertdriving.co.nz/uploads/1/3/0/7/130775633/8799309.pdf
    • http://files.dancelabnicosia.com/uploads/1/3/2/6/132681694/zepikisuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/isotopes_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/mastering_algorithms_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/58312084279.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6534/files/xobodubezoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1427/4720/files/43038454987.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/20486185264.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/applications_of_laser_in_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0433/8673/2707/files/gitumijupizifujewetodete.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/feromarimozoruwizaguwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5209/files/zazebobaliku.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_off00009492.bin
988b0ad72d8ca58f4f2e9b6b33bd96ab5c78a26634a53d3079f88a15974bc978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9492 5112 bytes
font_01_sfnt_off0000a5d8.bin
81bc5fd00be5f1beb371f4db2893dcb4902e00cde37923af1f4bf399f742a687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D8 11024 bytes

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