Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e3be81b81354c6…

MALICIOUS

PDF

73.6 KB Created: 2020-11-27 12:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d553c8c73cfa38465cefee3c5e7e9d5 SHA-1: 9b1863916292a6d3ea9486b4f2771ec6b827ea26 SHA-256: b9e3be81b81354c696da9d024a8f0bdc45df4174739526688edc1c5a9f5f5f48
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to game titles and application metadata, suggesting a lure to disguise the malicious intent. The presence of numerous links, including those to potentially malicious domains, strongly suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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=naruto+clash+of+ninja+revolution+2+kagura
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/662ce8730f0.pdf
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fa2986fa275f.pdf
    • https://xefozevinunakab.weebly.com/uploads/1/3/4/3/134340699/menil-forenitibek.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f87059617367.pdf
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fad6d404be88.pdf
    • https://cdn-cms.f-static.net/uploads/4457305/normal_5fb748614717a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/bf0fab5d-6a3b-4057-a8c7-01e1098bbfa3/96362307929.pdf
    • https://uploads.strikinglycdn.com/files/f916d9ac-c9a8-4ba1-add7-3f05419db925/80255163221.pdf
    • https://uploads.strikinglycdn.com/files/33e06ad9-ba5f-42ff-9967-2eca02c46fd4/84000942650.pdf
    • https://uploads.strikinglycdn.com/files/5dea1b28-df2b-4129-8446-883552b33e95/mupidemawag.pdf
    • https://uploads.strikinglycdn.com/files/6ce090ad-0211-4aec-b280-a2dc970e1fad/33641634171.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c754.bin
0258c710184b3937209cca1af04c4654473cfe556825ee017d40c3fc77c276cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 3476 bytes
font_01_sfnt_off0000d3c5.bin
14afdd2cd75e30cdf94451b40b4eb5f1fdb5ac71779e067afcb29197bdd52576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 5324 bytes
font_02_sfnt_off0000e5f1.bin
9f2fb16465c4137f171e5b411094486deb10e75b8cdb6153569f3ccc7af732f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10364 bytes
font_03_sfnt_off00010923.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 4324 bytes

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