Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5d56720ce52655…

MALICIOUS

PDF

61.9 KB Created: 2020-10-07 22:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 691f1c07040b9d07d77c75bf9b56c788 SHA-1: f43681058b77e4c47169d0e611bf8a2c312df1fa SHA-256: 3f5d56720ce526554e46f547f5a3e6c779b416a105fa3c7e2610c660af9d9798
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the malicious infrastructure. The presence of numerous disposable domains hosting PDF files suggests a link farm designed to distribute malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/pify?keyword=setting+of+the+great+gatsby In PDF document text
    • http://ketuju.tannerthetford.com/uploads/1/3/1/6/131606490/4203090.pdfIn PDF document text
    • http://pufuv.smealstudentcouncil.com/uploads/1/3/1/8/131871699/pufefujimugu-bodevijinozadaf.pdfIn PDF document text
    • http://pozewido.v-i.biz/uploads/1/3/1/6/131636648/6413737.pdfIn PDF document text
    • https://site-1038992.mozfiles.com/files/1038992/26475440022.pdfIn PDF document text
    • https://site-1036918.mozfiles.com/files/1036918/disaforonojuxof.pdfIn PDF document text
    • https://site-1038599.mozfiles.com/files/1038599/fukiruw.pdfIn PDF document text
    • https://site-1037839.mozfiles.com/files/1037839/99000840550.pdfIn PDF document text
    • https://site-1040885.mozfiles.com/files/1040885/53548139122.pdfIn PDF document text
    • https://site-1036939.mozfiles.com/files/1036939/gagagitojebijenutemibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37d7939-9ef7-4345-983a-f8922984491e/kidokanesatofiwosulujuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233cbc4a-60ab-4aa7-a9c2-c5c2e2cab0c3/jisevunoleredulakalukok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95147227-c903-4774-aeb5-4be97fbdcfb9/16484814916.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 5344 bytes
SHA-256: b900049d344db7525d4dfe7a095245a3081bbb4de9c50549cdfadf9c8c197af3
font_01_sfnt_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 10276 bytes
SHA-256: 914382f10e03b6318e3e52f0c6db2d035a88f0933073a6a5045cfed62103183c

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