Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadfe9d1c4106fed…

MALICIOUS

PDF

41.9 KB Created: 2020-10-04 15:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 527250019d94fb4e967a396c26837a39 SHA-1: 67b9a8749b93ad53d40fa993a069052c3c283726 SHA-256: dadfe9d1c4106fedb62c5c4103a732cadb413e0d725330571547e06e68994c9a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics, suggesting a lure to download potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=free+voice+over+scripts+pdf In PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/takejalizotonibe.pdfIn PDF document text
    • https://site-1039893.mozfiles.com/files/1039893/8002510229.pdfIn PDF document text
    • https://site-1039427.mozfiles.com/files/1039427/34332240464.pdfIn PDF document text
    • https://site-1042444.mozfiles.com/files/1042444/medexanedosud.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/kojazakunom.pdfIn PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/92480517750.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/65739656222.pdfIn PDF document text
    • https://site-1038489.mozfiles.com/files/1038489/85393414224.pdfIn PDF document text
    • https://site-1039346.mozfiles.com/files/1039346/kinujufages.pdfIn PDF document text
    • http://files.punkyreggaeradio.com/uploads/1/3/1/1/131164473/5ad56b3e89eb.pdfIn PDF document text
    • http://files.ethnographica-consulting.com/uploads/1/3/1/3/131384544/wezezolojoma.pdfIn PDF document text
    • http://files.theperksofbeingbookish.com/uploads/1/3/2/6/132681482/e73a6173.pdfIn PDF document text
    • http://files.darajafoundation.com/uploads/1/3/1/4/131483279/5f69d3ec7f5.pdfIn PDF document text
    • http://files.bennettallenwood.com/uploads/1/3/1/3/131382595/nibigig_wadogep_juwan_wutiguwolafobez.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/3d1f1bb3-3dca-495d-9347-b049fc15f28e/84272226783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a026b04-927d-4e8e-b732-4b6b9b88d55f/5166558932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bc37fc-966f-4cc7-bd4f-3a685b00595d/91423642324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cfbc39-0d8a-4b77-ab60-047fec183775/42960847570.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_off000067b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B1 4920 bytes
SHA-256: a87cee5106326bec939a8c8c343b131d2a0b3e229f470431730d36b4f1b0280a
font_01_sfnt_off0000788e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788E 10048 bytes
SHA-256: 6de0f3ee82a768122023535fa48857a3251690507c0d271bbeb5ac266a526347

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