Malicious PDF — malware analysis report

Static analysis result for SHA-256 7038dc4be6cd01a6…

MALICIOUS

PDF

70.5 KB Created: 2020-11-01 11:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1ccbba8bd0607647762cb7dc5762bd4c SHA-1: 1818f2564a72fe2101f3f03f630b8a3e013710dd SHA-256: 7038dc4be6cd01a6e8b35ecc00c4bd90d4ef4813683ce2afd75b43b0e8cd46b3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a lease agreement and a URL that appears to be a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a malicious link within the document.

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.link/123?keyword=free+simple+lease+agreement+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f8a2593cc4a1.pdfIn PDF document text
    • https://wimejevufafej.weebly.com/uploads/1/3/4/3/134379448/8043176.pdfIn PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/6521197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5f9c783cbc2f1.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/33c39266-5305-4b10-b828-c2f294129c8e/zalerifamitevafi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/arrhythmia_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8dd4ed-7485-40a9-af80-89c0cf658744/nupuwariwasulepipiwev.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/sizugebeteresigefikejege.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/25223940386.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/bangkok_city_tourist_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40129ccb-1fb0-4367-9250-a699eebbcec1/192867320.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/xixekavewepizojegeso.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_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 5316 bytes
SHA-256: f0c2af4baaa1b3539af1299679b72d6a48a88a7123f72f9cda1464987cca1465
font_01_sfnt_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 12260 bytes
SHA-256: b670daef4b0d867e11aea4b5b586ea8c9b42ba5943fb6f7c38d024b49632269b

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