Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd66318a1fe8f30f…

MALICIOUS

PDF

43.4 KB Created: 2020-08-29 12:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e3176e4c58d453392530694ccdae1f SHA-1: e895b53457c1077aaa0e235e50fb2b13d5330345 SHA-256: dd66318a1fe8f30f51de37157197c9328df6e3f79341d22d8430cb0d6c98044d
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, includes text suggesting a lure related to Spanish literature, and the embedded URL points to a redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link within the document.

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/wix?keyword=historia+de+la+literatura+espa%25C3%25B1ola+pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/nuligowetogatobufu.pdf
    • https://cdn.shopify.com/s/files/1/0455/4008/1829/files/mcdonald_s_business_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/burnaware_free_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/9595/6386/files/subibutomewak.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8a5c00ffe6a4e989d73a36d8f216866.pdf
    • https://static.usrfiles.com/ugd/b8c837_1db9cf71629548d7b3dc077b23ff0c00.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9663/7597/files/jevomomakadip.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8720/files/rainmeter_temperature_skin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/xonopiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/zaxefibejov.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_off0000670c.bin
911c14a4aebc2ad771ac5a1fc3cb451186bd279b1b85aa83c74099849bf71994		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670C 5208 bytes
font_01_sfnt_off00007887.bin
e1ee2d8feabf835aeb556f1b6a32461fc3012310e4d2e47c26688b6af929b04f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7887 11980 bytes

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