Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d87f7a1574680e…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 20:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d5234a7f12a5153666141b3fb5ba6fa SHA-1: 57c1711f757511b7e14b1005f35bb9a17ddc3489 SHA-256: 99d87f7a1574680e128da61bc72b8c12c4e40250e15449c998d5712cc960b971
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing lure. The primary attack pattern involves redirecting the user to malicious content via the embedded link.

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.ru/wix?keyword=ejemplos+de+densidad+en+la+vida+coti
    • https://static.usrfiles.com/ugd/b8c837_113321a4240248e5a9ef02794b89c394.pdf
    • https://static.usrfiles.com/ugd/b8c837_9dd735709d854609871dd0341f59683b.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fad0fd65e749edbd69c1ff0b3a1c86.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b45f645a8f446e1a05ee991c4a83db5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8784e4fc0e4d4eb795ca514308fdd585.pdf
    • https://static.usrfiles.com/ugd/b8c837_946623de2c8d4ae1bfa3c9e658859ce4.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e591a6907047dc93217a5834b16001.pdf
    • https://cdn.shopify.com/s/files/1/0454/0337/3736/files/gladiator_trumpet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6465/files/85289922273.pdf
    • https://static.usrfiles.com/ugd/87a178_5163d26106cc47a09fbbe306a4b1dbee.pdf
    • https://static.usrfiles.com/ugd/b8c837_04eef45f742f4f87acb1d72b3f3c0026.pdf
    • https://static.usrfiles.com/ugd/b8c837_3776a5ddc8e743ee883cc026ff267536.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a64e9ec32d43a7ada7c7ae41efe6a7.pdf
    • https://static.usrfiles.com/ugd/804ff6_1f0b971ad04747e7a38c5daf118475c8.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_off0000619d.bin
6d7368612b970f7344d3e324c20490d860a8163bcab2bc540683ae242b9978c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 5216 bytes
font_01_sfnt_off00007354.bin
8ab7f0d400d189f676d7baab06e43cc53a8599dce66a159e3acb8eb386366f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7354 11300 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.