Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f83716dd509e0a…

MALICIOUS

PDF

69.7 KB Created: 2020-11-11 09:34:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 805a0415980c0d68f38a2b8a3a850be5 SHA-1: c1984b2f0e53e3ac7c3fa534daf24b8b3d1c5fe3 SHA-256: 33f83716dd509e0a5108e294d385989a1b1e7ac1053cefec66322312eea30d99
184 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'gettraff.ru'. This URL is used in a phishing lure, likely to trick users into clicking on it. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/strik?keyword=facebook+ucsd+free+and+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f9150b395750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fa45fb70a31d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fa87d0c3c609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_5fa8f6b0b28f8.pdfIn PDF document text
    • https://lirabofopexile.weebly.com/uploads/1/3/4/3/134356775/7521335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f9b7c1cefd3d.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/lipew.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/xataxozuz.pdfIn PDF document text
    • https://sivirezu.weebly.com/uploads/1/3/4/4/134445297/dd02bb75f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f8d912e63efa.pdfIn PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/vulezozebixalas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f87e46371480.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/d64c0d9d-6e5c-47f5-89a5-9d160dc9bf33/xogunipapifudisibuxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f7ae27-a2d5-47d1-b394-17596d8758db/bujivexori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27d4aba-6d52-4079-b870-48fa4a8095d2/mufobinalidisefamopuru.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/battle_queen_2020_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/adda247_puzzle_book_in_hindi.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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 5172 bytes
SHA-256: 2960bbe989828ffdfeb4e57c796e88e15a6226d52bb59a6036c88f9da5259396
font_01_sfnt_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 11236 bytes
SHA-256: d632222907ccea50429d6abdc791f9b3fb1c521228cf7c6d76a3c09347c6894e

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