Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff40c655f6880cb…

MALICIOUS

PDF

50.3 KB Created: 2020-07-29 22:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a87f253f25d23324f6b1f78521a66d08 SHA-1: 43823be3f2d35b2b60aadc89daad9b05b7dc4ed2 SHA-256: 1ff40c655f6880cb822cb1d536d9cdd625ade8a9f9fadbd155f161d0167cd9cf
150 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 domains associated with link farms and redirectors. One such link, https://ttraff.ru/pify?keyword=knowledge+acquisition+definition+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains no readable content to provide further context.

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.ru/pify?keyword=knowledge+acquisition+definition+pdf
    • http://files.vreist-slimportfolio.com/uploads/1/3/1/3/131383934/fivegikatuwekivukiz.pdf
    • http://files.theaddhippie.com/uploads/1/3/1/8/131871614/9972893.pdf
    • http://files.schoolpatio.com/uploads/1/3/2/7/132740415/6232202.pdf
    • https://cdn.shopify.com/s/files/1/0438/3647/3501/files/97969133911.pdf
    • https://cdn.shopify.com/s/files/1/0432/8275/9836/files/59070113662.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/68706705413.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/kajipujimepowewoged.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/titowoxigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/30160212856.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/tepefufuvigo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7879/3878/files/zusugulevaxakuruvaduxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/temufaxilagig.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/68200681975.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/vakozete.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/
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/titowoxigo.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000871a.bin
8071926d6fb0ee5185aa185515f0c2685e53c821b00a26506fededa1ad6c9313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871A 5296 bytes
font_01_sfnt_off00009946.bin
ee7903d459870c589c72f57fd173dfa4428a13de4f26b10692a82fa64344fb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9946 10072 bytes

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