Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8a8e95649bbe27…

MALICIOUS

PDF

55.5 KB Created: 2020-08-31 09:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ffa462e8fabe4b8ffa26e7a931e80d SHA-1: 386c25384c68fb8beff48729f85fe6ab11e12230 SHA-256: 4a8a8e95649bbe27db2956c76aa920238450512c9e6d904e81b4552e37b58732
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text related to adult content and a URL that matches the malicious redirector. The primary intent appears to be directing users to malicious content via a link farm.

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/wix?keyword=japanese+uncensored+porn+videos
    • https://static.usrfiles.com/ugd/f1d680_c5e01a3cdc86403ea2369a501e777bd0.pdf
    • https://static.usrfiles.com/ugd/b13fd1_5950dd19e2054c55832532c59daea14d.pdf
    • https://static.usrfiles.com/ugd/b8c837_f44beb747a9245f6bf874a2b572fcb98.pdf
    • https://static.usrfiles.com/ugd/af0aa9_9a9ccee6a3634643941b94a1a08f47f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3ac721f6209430e97512b755d429ab6.pdf
    • https://static.usrfiles.com/ugd/b8c837_81fadbb4eae2488c930715aa006d745c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6324/files/26214064480.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/32130390853.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/xabuvozamusijuzitixur.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/xukeperefe.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/board_of_education_v_earls.pdf
    • https://static.usrfiles.com/ugd/451461_06e1b913f538446bbe746dd4e3ed4e10.pdf
    • https://static.usrfiles.com/ugd/6da380_8e31cff775b94e15a00c85efbcadbe62.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c32697e40e47429aa316643a28fa53.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_off00009c8f.bin
4ece2e31188c92a96ba0f444c8d10006f86ac890c7e5293a62a09c16c3aa08cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8F 5084 bytes
font_01_sfnt_off0000ade1.bin
7848d6ddfe2c15b08607449356be49461292cff827e3566e27b10869e9057965		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 10360 bytes

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