Malicious PDF — malware analysis report

Static analysis result for SHA-256 33192c5f98b81ac8…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 05:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc69e6ba04ac6a8e45fcb3071692161 SHA-1: 7601bd525fafd8caa168d46704c42d8e7bfaae01 SHA-256: 33192c5f98b81ac89b1f337e15efe5af01500b918d7c5d1d5f118b2ad070f0b9
152 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains a link farm of numerous PDF files. One of the embedded URLs, 'https://ttraff.com/wix?keyword=exercicios+de+produto+notavel+vestibular', is associated with known malicious redirector infrastructure. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of the link farm and the malicious redirector strongly suggests a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=exercicios+de+produto+notavel+vestibular
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/53328998992.pdf
    • https://cdn.shopify.com/s/files/1/0436/0192/0157/files/zoxizixufegoloveximuxo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/zerulakogeguxekugewisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/48971007569.pdf
    • https://static.usrfiles.com/ugd/b8c837_faf4b760045644569e9bacd5aefa5609.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67cc1a50274440aa9e2f9275bacda63.pdf
    • https://static.usrfiles.com/ugd/b8c837_0594815748e246db8b4e46d8f2873dbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cd52917e14841fa9d6d8f502e6b7cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ef4a914d18b43e38ab06a1d212f65a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a644aabf54cd4891aee24555feb8c015.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b59d6537ef348f5a778430726f63811.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c0b106612424a5fb229895303f43756.pdf
    • https://static.usrfiles.com/ugd/b8c837_414a5907a502422099ed7ca15f789931.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6d01602948841ca831d1d93a96542a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8738e8a612a24cb0b2144fae0ad51479.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb68693a3e90478bacdf1b04194693a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_48d665f90ae145c4bd3e3d105c951bb0.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_off00006142.bin
b0a8c21e7fc0f126cb575a380a0278833ad7df2bd746a4b239daa19a04fec799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 5292 bytes
font_01_sfnt_off0000734e.bin
94e6cd9226e5af27cd7124729e40b05f823e90feb76431e4c1a96be400fe0aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734E 13464 bytes

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