Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff68ebb17f97a6ff…

MALICIOUS

PDF

41.3 KB Created: 2020-08-04 09:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c8581264cedb1379dad649f9ccb93db SHA-1: 86967544dfd06c406cf081014bfb27d9f57ffb6a SHA-256: ff68ebb17f97a6ffc3e28605eab82121f5ee7ab0304a9dadb7b19f2d3394ad10
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 Shopify domains hosting other PDFs, creating a link farm. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains keywords related to 'american flag coloring pages pdf' and the wkhtmltopdf generator, suggesting a lure to disguise the malicious intent. 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.ru/pify?keyword=american+flag+coloring+pages+pdf
    • http://files.nuuchem.com/uploads/1/3/1/3/131380604/9d7c13dc8676.pdf
    • http://files.gogovernors.com/uploads/1/3/1/4/131406762/6528224.pdf
    • http://vofojejam.devinjamesbaldwin.com/uploads/1/3/1/4/131437736/6b2758c.pdf
    • http://files.asktheculturequeens.com/uploads/1/3/0/7/130739831/rewijedawasigewesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3133/0969/files/banotopigirozikabuwuxer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/jasufigokasifiwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/failed_to_login_invalid_session.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4555/files/xofuzuromenagivagir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/54590043298.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/53569600934.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4025/files/43780046575.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/tafowetezunupegemupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/xasavepaxafurazuwaxine.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_off000062ce.bin
a176e1affa573d81c32bc234dc7a833bcdb7e6443cfe646dfa20a489db0bfb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 5464 bytes
font_01_sfnt_off0000754d.bin
3b3384293bc7d705cd218150f65ab8ed9b42c891578fad30b4156b5e0efa123a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754D 10272 bytes

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