Malicious PDF — malware analysis report

Static analysis result for SHA-256 411155ba15a9141f…

MALICIOUS

PDF

44.8 KB Created: 2020-09-01 04:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f5a05d8435ae5a4fc7be618bf04eeea SHA-1: a20d8de44895314c44e08d653bed7c9cdbaa119d SHA-256: 411155ba15a9141f0a2dc74fdff6f83f44182e8f2e359be3b9421f445d1fb583
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large farm of external PDF links. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. The primary attack pattern involves luring users to click on these links, which likely lead to phishing sites or malware downloads.

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.club/wix?keyword=similarity+transformation+linear+algebra
    • https://cdn.shopify.com/s/files/1/0438/1310/9920/files/78434333406.pdf
    • https://cdn.shopify.com/s/files/1/0456/5244/3303/files/67937910554.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/11961160391.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/jivirukuzuwuzimejigu.pdf
    • https://static.usrfiles.com/ugd/bb13a2_559609dc503041f59757c6ea8895b215.pdf
    • https://static.usrfiles.com/ugd/b8c837_11e581ef13624aa7a70b29450cc945d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c65af926c56240ddb3ca1dde6b75fe90.pdf
    • https://static.usrfiles.com/ugd/b56239_904e851a24424051a637a9934bb83a9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_110147b973d3491b885b5105fb3fb8b9.pdf
    • https://static.usrfiles.com/ugd/eaf48f_ebbf10ce69584b7b98cab548997a00f1.pdf
    • https://static.usrfiles.com/ugd/63022f_0e44c133c22b457e908f6f95016992fe.pdf
    • https://static.usrfiles.com/ugd/8cbfce_c9ee0ff351fe4f2cb865a89bb4e2b90d.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/wezed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/dojusovoguwiritebexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/zudobegika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ranugebiwuzejivuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/30157671413.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_off00006666.bin
a86cf0613dc4c63c99deb0c4a676d6604488073e0019c572a6d5fa696ff89c14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6666 5432 bytes
font_01_sfnt_off000078d3.bin
12d0892c98d7614d22d41858bb92aa101bd441f3f54bef29181ddb994b7983e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D3 14480 bytes

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