Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc86784296b2853…

MALICIOUS

PDF

37.8 KB Created: 2020-08-31 03:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db3dac3ab8cb9af4211ec2bb475f497 SHA-1: 0a4c4e9464598e0b26c482b67e8712a988446e33 SHA-256: 1fc86784296b285384b5ad1213185a9212e177ff19987559ef219f13a0a94be4
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wix?keyword=mts+to+mp4'. This indicates the document's primary purpose is to redirect users to a malicious site, likely for further exploitation or phishing. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=mts+to+mp4
    • https://static.usrfiles.com/ugd/7ea8bb_136132a490ad4e3f926e52f6d34e89dd.pdf
    • https://static.usrfiles.com/ugd/45e30f_ee97ed04f2e4486ea0427252c64f2c99.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_f92217a88313410c93ea02616bb24dea.pdf
    • https://static.usrfiles.com/ugd/b8c837_7101b0d36d224c09a1dfc957bd7963af.pdf
    • https://static.usrfiles.com/ugd/3826db_bbf71664ba184355b7c830766ad4a152.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecf87b87e9d6415997fea48b7193cf8d.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_e89df0fd22ac45a8a417edc070cbed31.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/noxamomisoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6380/4058/files/jojezodomokumevinivif.pdf
    • https://cdn.shopify.com/s/files/1/0465/5097/4614/files/english_for_everyone_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/32789556512.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_off000058a0.bin
ed0c0992d0830655f297df1c89eb186a886ae9caafc07c58cf1b31b403ad5295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A0 4720 bytes
font_01_sfnt_off000068ad.bin
b514da71fc3b1f24f30969ac4ebfdaa66847f2973f4f6d9dd2de7dd199086a28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 10120 bytes

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