Malicious PDF — malware analysis report

Static analysis result for SHA-256 535aba49d608faa2…

MALICIOUS

PDF

47.9 KB Created: 2020-10-02 16:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 133519bc6e203bb49da41a9a39a13381 SHA-1: 4aa3411407be43b6a12bdc4fdd4c4cf9ca04903c SHA-256: 535aba49d608faa2e42837bfbc1eba06a115e9af9912f49e1ce3b269487354d4
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=normas+de+auditoria+generalmente+aceptadas+pdf In PDF document text
    • http://poreduw.revivalmission.info/uploads/1/3/1/3/131379856/0a9699cd56e75d.pdfIn PDF document text
    • http://files.darnisart.com/uploads/1/3/1/4/131483234/mijekavuzuz_zawafakesiz.pdfIn PDF document text
    • http://xilaxezag.lforlupus.com/uploads/1/3/0/7/130775451/2663980.pdfIn PDF document text
    • http://files.volunteerconnectnow.org/uploads/1/3/1/1/131164446/pajekosakuw.pdfIn PDF document text
    • http://files.redseaview.eu/uploads/1/3/0/7/130775306/3988308.pdfIn PDF document text
    • http://files.atomicthreadsclothingboutique.com/uploads/1/3/1/4/131483128/df53a1be4.pdfIn PDF document text
    • http://gusiso.caribooliteracy.com/uploads/1/3/0/8/130814058/patusawoxine.pdfIn PDF document text
    • http://nubud.afrofuturism-game.com/uploads/1/3/1/6/131637279/zugurevok.pdfIn PDF document text
    • http://tuwozata.whynotpromoshop.com/uploads/1/3/2/8/132814930/fosakubajujiba.pdfIn PDF document text
    • http://files.spjayaraj.com/uploads/1/3/0/7/130775525/2906685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/175f9fce-27ca-4df0-8317-3740b79a25b6/fajet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb4569b-0b2d-4981-83ed-2bde7736e7d5/toxobatuweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d676ef-3b51-40f9-94a8-9ab5bfe5511c/45320054395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69230ded-ffa8-4ddd-ba9c-28d4bc855db1/32048332467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08b7a33-b9fd-41b8-b629-c1be60271e0a/95137790676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5796/1365/files/dragon_ball_evergreen_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4806/2106/files/bacon_wave_target.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/45064525992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2469/0583/files/applications_of_quadratic_equations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2379/7911/files/zowulofefutirigatomapa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A19 5324 bytes
SHA-256: d3e97147fcca84107eeac9d30f4a9c9593f5e93a60f53446bb2239496df72769
font_01_sfnt_off00007c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C18 11572 bytes
SHA-256: 4131ba7f5ead13624d99047d45fcf8a1ba158ab8451c7d112673b70c4ad346d2
font_02_sfnt_off0000a1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AD 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34