Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da37d0d91e2d055…

MALICIOUS

PDF

35.5 KB Created: 2020-08-30 05:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 645d230d52509daf858e4ba9b103e49c SHA-1: d08c7af17837c6e18b41036fa4315bfb2f199d9a SHA-256: 4da37d0d91e2d055dde97881af7ff25f4e5357b0111289394cbae14680cc7260
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on CDNs. One of these links, https://ttraff.cc/wix?keyword=calculus+early+transcendentals+8th+edition+james+stewart+brooks%252Fcole, is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious content under the guise of providing academic resources.

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/wix?keyword=calculus+early+transcendentals+8th+edition+james+stewart+brooks%252Fcole
    • https://cdn.shopify.com/s/files/1/0460/1407/0945/files/vilutedixanob.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/diwimodesavuxivufug.pdf
    • https://cdn.shopify.com/s/files/1/0434/6288/5541/files/kemupoban.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8582/files/58263810977.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae95686640544d5ca30e516b118348ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_920ece2f56c643e299f179c7d6249eb3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9665/files/60887438936.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/remisilekedonifatagula.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/business_communication_today_10th_edition.pdf
    • https://static.usrfiles.com/ugd/01e791_032bb1f74c904792a5189de9a8e7b64b.pdf
    • https://static.usrfiles.com/ugd/b8c837_97c468cfd3ee45e4b0c3034c15c84f8b.pdf
    • https://static.usrfiles.com/ugd/271e65_58c960f3d285428eb2e174da594fa8c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c91d1cdd20489fab72408da3a639f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_81e8c549e290426da2139fed73d8dbea.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_off00004b9a.bin
d0d750e8431f817bd33fa3998a545840d685bbb41e9888fda17e38091082ee57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9A 5788 bytes
font_01_sfnt_off00005f2e.bin
646da3659467729a6904a9bba099caa6563f42c680859acda24ce80d3747ca28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 9816 bytes

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