Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90dc4db6a2e6231…

MALICIOUS

PDF

67.2 KB Created: 2020-11-26 01:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 60c97b1d9785e73632114aa3f9f93a1c SHA-1: d040518e20323ed58d7ed40bfce8fbc8641ba52d SHA-256: b90dc4db6a2e62317ba747d2db235576ae1b6ed2cf016cd1abf325aede2b116a
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains embedded JavaScript and links to known malicious redirector infrastructure, specifically 'https://traffmen.ru/strik?utm_term=kingroot+apk+download+for+android+oreo'. The presence of these elements, combined with critical heuristic firings for malicious redirectors and a link farm, strongly suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://traffmen.ru/strik?utm_term=kingroot+apk+download+for+android+oreo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_5f920a68c8479.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/3947386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f8755c8934ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5f9f0e043a22f.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/2586399.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/mulerux/define_supporting_detail_in_an_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/structure_of_the_human_eye_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb094df-f4bd-492d-aa1f-bb74b214a879/74636769282.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/28944966036.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/barrier_beach_formation_a_level_geography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d51e2a-575d-4412-a717-3f36b0f79680/jofelitoralafopuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eb8506d-e252-427e-a2b4-a58473760606/ped_egg_refills_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00f0af4d-bc62-40be-afb1-57ad50c9e223/aplicaciones_de_la_genetica_en_la_agricultura_ecolgica_y_ganaderia.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_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 5156 bytes
SHA-256: 1312dadf8b13c50e3ea683da7ac00058be07f0475008bd8ac30db309f9c1f3cc
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10576 bytes
SHA-256: e1c9e45a02902f9201e2db977c5d42a3f6919c2f7c48ecfe398a83d1d0e02daf

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