Malicious PDF — malware analysis report

Static analysis result for SHA-256 27869ada4a26653f…

MALICIOUS

PDF

43.5 KB Created: 2020-08-03 21:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 686081bdcffdf9d1a7725cb1dbdcc0df SHA-1: cf23ce6033cb76e72006aeeacb5ea4ca187ed231 SHA-256: 27869ada4a26653fb8c2024b53d7dc270355b7b115d964d67f0e459df2b367f5
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=pleural+effusion+treatment+guidelines+pdf'. This indicates a link farm or SEO poisoning attack designed to lure users to malicious infrastructure. The document body text is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

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=pleural+effusion+treatment+guidelines+pdf
    • http://files.patriciabridewell.com/uploads/1/3/1/4/131452887/8f269deff80.pdf
    • http://files.seashellsandlemons.com/uploads/1/3/2/6/132696030/4372326.pdf
    • http://files.sjtanc.org/uploads/1/3/1/4/131453249/lodozunagize.pdf
    • http://files.colacotwayartstrail.com/uploads/1/3/2/6/132695294/dd1363fff.pdf
    • http://files.amyouthsports.org/uploads/1/3/1/8/131857152/jopisopiza-takebeja-xizoxav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/gakixunulelivodigana.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9073/files/wukenazixulipimibere.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/laxomipuwosigazumuwix.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/56509476520.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/21506627001.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/rifavanijizazol.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/retizodokuwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/xofozukar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/42641334969.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/soxiritovejizesapamunabex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/71739937530.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_off00006bcb.bin
2499b652c2bc72d50ee931ac3874b7fb7cebd61b05bbd10b8ed49a53cc10d5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCB 5360 bytes
font_01_sfnt_off00007df4.bin
a42a5b7cf5d172d207f4e6ffce3017c282583ac20820833b5aeab177db864b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF4 10112 bytes

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