Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b27692a8d15f31c…

MALICIOUS

PDF

72.7 KB Created: 2020-12-28 21:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 054d3787bcb78499432aa4210ba764af SHA-1: e172176fe669a8f335689e561e58a7ba16fda75a SHA-256: 8b27692a8d15f31c53bcfd15126553c4760d28ffeb1a5ca60e614cbcddff7607
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://gettraff.ru/123?utm_term=quit+claim+deed+form+staples`. It also hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=quit+claim+deed+form+staples In PDF document text
    • https://static.s123-cdn-static.com/uploads/4460706/normal_5fdcc484677cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_5f8ef4b7ce412.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/bajowazesisoj.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/zaxopamumini.pdfIn PDF document text
    • https://zamosokajuzosa.weebly.com/uploads/1/3/4/6/134651904/7997053.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/f9ed16cb-b893-4cb4-be59-09af2477c49c/wadisakuduvimikisedoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022de12c-9d56-4fa4-8e0c-832a8e043974/lororawovenovozapufadabew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9515b245-fbf4-42dd-920a-10eee935c2ef/rixewenojalavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6101a7-eba4-4419-9106-3358a26cb849/shes_so_gone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc2f1b1-ac25-4705-9576-3652259697c5/jopupijiwotodugaratigite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01009675-f6b3-42c4-86a4-47deb7e29120/pokemon_go_mod_apk_download_for_android_2019_latest_version.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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 5360 bytes
SHA-256: c2e433779e96d5c6396e30d431fc6e96092183c3c30876a261f993fee5e2541a
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10568 bytes
SHA-256: c48484e1f27dab71fc67c7c77c7fc60535a4569fdcd420abfbd02f5b4bff6632

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