Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dde40679631754d…

MALICIOUS

PDF

47.9 KB Created: 2020-08-21 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a0280ea84d8cf14832a4a1287b48c86 SHA-1: 8896cee7c3c3253b3bc3d3a059b951b43d8d7691 SHA-256: 8dde40679631754d6b40f8b1ebde26b8a383238bd94a36b3e2706172ab6f6eee
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'basic spanish grammar workbook pdf'. The presence of a mass external PDF link farm further indicates an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The primary malicious IOC is the redirector URL.

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=basic+spanish+grammar+workbook+pdf
    • http://files.kineticaussies.com/uploads/1/3/2/6/132681698/3291697.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/lizesaga.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/dobuleri.pdf
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/ancient_greek_philosophical_logic.pdf
    • https://cdn.shopify.com/s/files/1/0440/8783/6822/files/bubib.pdf
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/bailey_and_love_surgery_27th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0447/9080/8727/files/70891881053.pdf
    • https://cdn.shopify.com/s/files/1/0460/1508/6759/files/63082396874.pdf
    • https://cdn.shopify.com/s/files/1/0440/9566/8376/files/nusigafoxekeki.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/jewesimisenot.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_off00007ce5.bin
cb429c2ee73ebe7f3007275c8d12c5065781a6929970e2f5996fc3fc8e0215ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 5880 bytes
font_01_sfnt_off000090bf.bin
fc48b8255000fb12b70ec73bde85103dfa1472d65ffae81d9ead0390b47fb1b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90BF 10024 bytes

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