Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ef5bb6144c0f01…

MALICIOUS

PDF

48.4 KB Created: 2020-08-11 23:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b40878e49a4c3ec74c9c07d9ffe5adba SHA-1: 6974098a48f425fadeedb92a28876e90608c07ed SHA-256: d6ef5bb6144c0f01e8143e9fc41503271fc502557c30c96e5e814110b7485cac
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=minor%207th%20chords%20piano%20pdf
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdf
    • http://files.mccombwholesale.com/uploads/1/3/0/8/130874523/66696087308b750.pdf
    • http://detexemo.1infinite.com/uploads/1/3/2/6/132681946/4aef2ee2f7038.pdf
    • http://files.kidsneedyoga.com/uploads/1/3/1/4/131438786/zafasaza.pdf
    • http://files.wholesale.fanhubnw.com/uploads/1/3/0/7/130775145/e1a73bf7.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/52352672247.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8702/files/arbitration_adr.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/5044574112.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/book_of_mormon_musical_libretto.pdf
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/77552767413.pdf
    • https://cdn.shopify.com/s/files/1/0433/5747/0872/files/grey_fifty_shades_of_grey.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/69291755943.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/64374247579.pdf
    • https://cdn.shopify.com/s/files/1/0429/1123/6259/files/dekanunatet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/63140678919.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d40.bin
8b148fd3fc307b8723d024857b0549ccac68a4aa04c97a02835aadab0b901378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D40 4968 bytes
font_01_sfnt_off00006e1c.bin
bb0995001e230b2c7d4fc3528646e43d0beabd46ce630def1ff38f37de7c6038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1C 10184 bytes
font_02_sfnt_off00009133.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9133 16120 bytes
font_03_sfnt_off0000a61b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA61B 4324 bytes

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