Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85ad528da020b6a…

MALICIOUS

PDF

68.0 KB Created: 2020-12-24 22:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b682a2b7fa5fd79314dcafdab76c3b68 SHA-1: ea485136fad58b5100010fa774af62ce3847817e SHA-256: a85ad528da020b6a67994707950986047227aaf53a16893d2d03e40174b8cd6a
252 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 cctraff.ru and a large link farm hosted on disposable domains. The ML classifier also strongly indicated maliciousness. The embedded URLs and link farm structure suggest an attempt to direct users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=neighbor+home+smasher In PDF document text
    • https://cdn.sqhk.co/disidudi/ihzYijW/sutubejezuxe.pdfIn PDF document text
    • https://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/779397.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/kukowinotesem.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/laveriwevafonosezuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496582/normal_5fd03045790d8.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/UjahgB1/64826796134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_5faa5787f248f.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/dhayzfo/67137346903.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/258d59bfeca.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/ceff23fb-895f-477e-95c4-a8cbb1afbffd/kigoruwi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/69832517548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b624cd3a-c5e3-415f-aecd-3a7c85c836b6/ib_physics_lab_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d38bca-93a3-4c7e-82d6-6917aff9a398/veduvipem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d282fbe8-3731-4d82-8372-40bd8b8f2130/mission_soledad_today.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_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 5176 bytes
SHA-256: a270e2977ebd7e441085bd90d0b1a8c5dd4a9eb9906c5edca6853b8532904759
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10256 bytes
SHA-256: 8b4afe4673cc22a172a98d5ff5c58db108a8b8effd0446c220cbf91b5eccdbfa

Open this report in the interactive analyzer, or submit your own file for analysis.