Malicious PDF — malware analysis report

Static analysis result for SHA-256 913520048ae776d4…

MALICIOUS

PDF

61.8 KB Created: 2021-01-14 02:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb05758a30f5eba1ebd560830ae14c31 SHA-1: d97a72fbec41b4d379a5c8387b6cfdca852e00d5 SHA-256: 913520048ae776d4f0fe35b590544334494c235dd5020c09ccfd9294f6b69bea
184 Risk Score

Malware Insights

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

This PDF file contains a link to known malicious redirector infrastructure, specifically `https://cctraff.ru/123?utm_term=chimney+caps+lowes`. The heuristic firings indicate that the PDF is designed as a link farm on disposable hosting, aiming to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/123?utm_term=chimney+caps+lowes In PDF document text
    • https://site-1171473.mozfiles.com/files/1171473/matrixyl_the_ordinary_deciem.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/2a406a81f24ab.pdfIn PDF document text
    • https://site-1175656.mozfiles.com/files/1175656/28917662397.pdfIn PDF document text
    • https://site-1174987.mozfiles.com/files/1174987/rarogojujegobaju.pdfIn PDF document text
    • https://site-1171686.mozfiles.com/files/1171686/35789432801.pdfIn PDF document text
    • https://site-1227468.mozfiles.com/files/1227468/fussball_manager_2018_vollversion_kostenlos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd19cf10cf57.pdfIn PDF document text
    • https://site-1195638.mozfiles.com/files/1195638/86866466971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/android_studio_anim_xml.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/albion_online_android_release.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_off0000babb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABB 5176 bytes
SHA-256: da7859446a33f8d816f6d96c4b544af7eb16d16f2954c41762ac317034d79e74
font_01_sfnt_off0000cc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 9092 bytes
SHA-256: f6f74acf048a0d4013a536dadd1e3ec43aa24c079343e1a1db0245fa2b418802

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