Malicious PDF — malware analysis report

Static analysis result for SHA-256 f115e00605d89085…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 12:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a97cd77a84866d861cda7ea615052a56 SHA-1: 303dfdbfee232ca3bf65a17fff0d35defac5c71d SHA-256: f115e00605d890854c9fc0d9ae4503d275aadb1569e57fb2ca6696c29c490c71
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an answer key, a common lure for phishing or malware delivery. 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.com/wix?keyword=algebra+nation+answers+section+1
    • https://static.usrfiles.com/ugd/b8c837_29a7fe3bc7af4bcd967d8bfe3dc4be32.pdf
    • https://static.usrfiles.com/ugd/565485_4e0158a20242451b82393ac3ef0473a5.pdf
    • https://static.usrfiles.com/ugd/544c7e_2a182a3d62af43e1bf3af93d5d0372ae.pdf
    • https://static.usrfiles.com/ugd/71fd01_95f15af14a6e45dc9b0eb3b28baa5df3.pdf
    • https://static.usrfiles.com/ugd/0286dd_af76705023e340d185335dd925ae70ae.pdf
    • https://static.usrfiles.com/ugd/0511f5_d1776eb6bf1a4b24838cf51b20d3b6e6.pdf
    • https://static.usrfiles.com/ugd/d01287_6b23411f05ff43cdbf21bc588ddedbde.pdf
    • https://static.usrfiles.com/ugd/b88e3d_fb9110bb9ca24ca3a4b2068abbdb803e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bcc7ed12d6f4e20a27e744070c3c711.pdf
    • https://static.usrfiles.com/ugd/5bb01c_4246749f410b4e0981f01b51f4e7fbcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8f7d119cd7a4af69d3d0cf4b5e29ad9.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_off00005d18.bin
26655ca4a5865ec2a91c9f61b1cc1479172e3b022c47271e3c21de6b782d94e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D18 5240 bytes
font_01_sfnt_off00006f0a.bin
8bf5495124a5e6f2cc95d5a81363f96ad809ab21a705de54ec6191358858feeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0A 10456 bytes

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