Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aea3c07e2a67e4…

MALICIOUS

PDF

68.8 KB Created: 2020-11-21 07:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d589543ab9da51050be7c13376b0ee SHA-1: 1cd2892ddb84b6038f87a96fedd13020492ef9b3 SHA-256: 20aea3c07e2a67e4e82b9d77a0fc98a1e80645f7b3e9b57ba421451a8bcfae2a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect the user to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=grimm+brothers+tale+pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/1649241.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f91714acd538.pdf
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/5702894.pdf
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5f96d88fdfe28.pdf
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/zigipisoboz.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/zesusanawed-zixuvewenisu-xaxerag.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/0766ad55d74.pdf
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f9974f7db2b0.pdf
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/08c81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55511e04-3160-4643-83f8-d24e6663bb3a/55863359843.pdf
    • https://uploads.strikinglycdn.com/files/3d0bb92c-8549-4667-977d-f82759bafa66/tivova.pdf
    • https://s3.amazonaws.com/xedewofuretujo/full_metal_jacket_screenplay.pdf
    • https://s3.amazonaws.com/punurum/ge_gtwn2800dww_repair_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d143.bin
2a17006d65133f9044f093721d22a04d85fd0842f75d2d560ef6dbdcd517b5f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 5452 bytes
font_01_sfnt_off0000e396.bin
d69140374c41f5b0e3865f055ab0c242b924cf12456a670c0ef2b58c620ab1f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 11000 bytes