Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bab8fbd1d9909b2…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d36dd5b8a2fb98d2037ef128204afca SHA-1: fe6a8cbbca996ee7f35fd548a005bdc60551950a SHA-256: 8bab8fbd1d9909b27dc20976360fac8c7580548368674096863d8d92ab7d0067
150 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'childhood disrupted pdf'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=childhood+disrupted+pdf
    • https://static.usrfiles.com/ugd/5b604d_69a10d72899c4dcaa55adfa4d3264a63.pdf
    • https://static.usrfiles.com/ugd/b8c837_76aad2d728b14300a16c97fce72db967.pdf
    • https://static.usrfiles.com/ugd/b8c837_80e19b26f10240deafd219c1f00d60c8.pdf
    • https://static.usrfiles.com/ugd/b91566_e6a564104c0045efbd85b14ecae4a2e4.pdf
    • https://static.usrfiles.com/ugd/ca32a8_90581fb336064e518e3e417c333eec58.pdf
    • https://static.usrfiles.com/ugd/de65f7_67cdee330f054c9caf816aa96189f66d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/91912011024.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/bapare.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/jugomowosebimelar.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/tps_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/90698444755.pdf
    • https://static.usrfiles.com/ugd/97368a_303390597baa4adb9611f612f78a7257.pdf
    • https://static.usrfiles.com/ugd/1849a1_94334bcc00864104a9d002335f000bbd.pdf
    • https://static.usrfiles.com/ugd/8de238_f7da800cf3c84cb9b11dd70043785887.pdf
    • https://static.usrfiles.com/ugd/3d0627_c9c1bc48204747829247adba632062b5.pdf
    • https://static.usrfiles.com/ugd/15cd4d_48bef142785747a69d09a7d3f9a6edbb.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_off000072c6.bin
3d72486188a8c28b7937269d6473dd581406503b4193c63ec63c67a31a69cdda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 4824 bytes
font_01_sfnt_off00008325.bin
dc49300bfcd9ed6008acb3ce4ec0054eb2c7f463e4635979699bdc6da17824d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8325 10480 bytes

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