Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3ab1548c717bdf…

MALICIOUS

PDF

76.3 KB Created: 2020-12-30 13:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a5f5df98aac46cb870d28ed5ba0ee6da SHA-1: c8b75eaf99755f4ebf48de33e30b15395272a74d SHA-256: bf3ab1548c717bdf561467e208c669863b4e372f374563c3b4827de693fc6dc2
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary redirector URL, 'https://ggtraff.ru/strik?utm_term=free+cubes+for+blockman+go', is flagged as malicious. The document's structure and link farm indicate an attempt to drive traffic to malicious sites, likely for phishing or malware distribution, consistent with a spearphishing attachment.

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.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=free+cubes+for+blockman+go In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_5fd788545245d.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/wasezaketutodonu.pdfIn PDF document text
    • https://sumomaduge.weebly.com/uploads/1/3/4/8/134884200/41ed9bc26a85ca5.pdfIn PDF document text
    • https://romadixisom.weebly.com/uploads/1/3/2/6/132681692/vojikimasugufiko.pdfIn PDF document text
    • https://bizepusenovub.weebly.com/uploads/1/3/4/5/134509919/madobewevafo_niwavomitorix_karemewawunu_komasifolewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_5f9fba46ef803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5fa209d2cc0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_5fa68c0492264.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/9325db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f99bbe55d5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_5fb3629814e38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fc4bb162f3ca.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/5c348a99-d6a7-4bea-9f69-ed7bd9983a22/pai_iso_atlanta_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34bedd5-6dc1-459d-9c11-ffbdb1292e11/gelugenulib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6aab0e-56ba-4c99-8ed0-a174eb7faf59/timex_clock_radio_t309t_manual.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_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 5360 bytes
SHA-256: 48be86b05ba4590fb40f2c4fb8b61cfcae2565ce0d74107044c7315231a670fa
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 10536 bytes
SHA-256: c8dd384817ea041e39c48b9507e27493b34c924aa87d16fc1dc8f73eb99c7756

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