Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01211cc06c80654…

MALICIOUS

PDF

99.5 KB Created: 2020-12-20 02:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b341ee95985203f5255249e5c876ab46 SHA-1: 22bee7498e82327525b660f954ec139acdcdb3d6 SHA-256: a01211cc06c806544b4e50ae9b78d4510dfc83a1e058d3ea4844daa2502344bc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for linking to known malicious redirector infrastructure and participating in a PDF link farm. The primary malicious activity observed is the redirection of users to external URLs, such as 'https://traffmen.ru/strik?utm_term=royal+tenenbaums+script', which is a common tactic for phishing or malware delivery. The presence of numerous embedded links suggests an attempt to artificially inflate search engine rankings or distribute malicious content through a network of SEO-optimized PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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.
  • 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=royal+tenenbaums+script In PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/7096576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fad3e8880468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_5fd84a2a3b166.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/78b73ec5-b273-4755-ae8f-d170c93069e4/22033449211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0a507c-4d57-410c-97b4-74b0d0ca86d7/5705347855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615aec41-04ec-4a89-aaf6-bd9280a8904b/sepupetelunuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae531b6-36d3-4cb2-840b-a75ab672d43e/85295667868.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c8b6405d5340f335e453/t/5fd1abed87bef85997ebdd41/1607576559333/sausage_wars._io_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52f60a0-c161-4406-af76-f93155b2ba83/caracteristicas_del_movimiento_vanguardista.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_off00014c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4B 5328 bytes
SHA-256: a0b64730e9040d01da32a8a5642ff1c413a1f3c6119283bc10f0238bd941cd69
font_01_sfnt_off00015e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5F 10360 bytes
SHA-256: e446bb035c7e955aed9e6f28be32f20e9038dde52f9c32135cbe8ab139fdbbfc

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