Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f45907d28ed48dc…

MALICIOUS

PDF

39.7 KB Created: 2020-09-30 05:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a0c9d10151f569776a214843dbfefbe SHA-1: 891c2f3e23d7dd40912669294aadb9c21cda9d0e SHA-256: 8f45907d28ed48dcea236629116a8b2a6d32b5eadf3e64aa04b9d123d50ff933
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One of these links, https://cctraff.ru/strik?keyword=meningitis+por+bacilos+gram+negativos+pdf, is identified as a malicious redirector. The document's structure and the presence of numerous links suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://cctraff.ru/strik?keyword=meningitis+por+bacilos+gram+negativos+pdf In PDF document text
    • http://files.geyette.com/uploads/1/3/0/7/130740186/vigaj_pogulezivitogo_mimupulinatojuv_wotuladebiduxa.pdfIn PDF document text
    • http://files.taniamcmurtry.com/uploads/1/3/0/7/130776363/1793103.pdfIn PDF document text
    • http://files.bitcoinfuturesguide.com/uploads/1/3/1/3/131397987/bavobezurevojo.pdfIn PDF document text
    • http://files.findtheyeti.com/uploads/1/3/1/4/131410545/tofosu.pdfIn PDF document text
    • http://files.glittermesassyonlineboutique.com/uploads/1/3/1/6/131636890/9c8009b.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/wuliropipajijuv.pdfIn PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/tamupidubivegaleseful.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/dumebobasebasug.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/9c01d718-a363-4874-829e-344a23a37653/zisomegusojubejuzab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbb3e7b-985e-4ef1-99b2-6289ff2f386d/83822368060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486bca2f-b286-4e89-a6be-a5d74fdf07c9/vavewopumipavagasoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa227d9-43b3-4136-a2e1-2b19a490314b/mevedokegegoxomozewemine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99dcff94-73df-4c39-af0c-78d4d1f381d8/sarigarasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/086b9066-04d6-4d9e-9ddf-3ca57fda2d13/54523193100.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_off00005d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 5680 bytes
SHA-256: 52a45d75f11f4d1f5af4800eec665e0a51189aee5de8927faf08231e272f23a1
font_01_sfnt_off00007088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7088 9804 bytes
SHA-256: 439f5359b84f718ffadff37b4f94715df5a264514ff56a99fdcecf27020d4927

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