Malicious PDF — malware analysis report

Static analysis result for SHA-256 5348c88d1468fddb…

MALICIOUS

PDF

42.8 KB Created: 2020-10-04 10:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7d06a4d7170d0728062ca219330dd24f SHA-1: ad81120f0915f918eaf424da72a3a2380c2dd510 SHA-256: 5348c88d1468fddbdb806f8a537ea687981d04da5432b02641f18800435db12e
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the primary purpose is to direct users to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users.

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=the+united+states+constitution+scavenger+hunt+answer+key+history+with+mr.e In PDF document text
    • https://site-1040096.mozfiles.com/files/1040096/rubijuminabito.pdfIn PDF document text
    • https://site-1037121.mozfiles.com/files/1037121/57392688674.pdfIn PDF document text
    • https://site-1036811.mozfiles.com/files/1036811/40864706473.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/nanobebijez.pdfIn PDF document text
    • http://files.maapparel.com/uploads/1/3/0/9/130969727/ziwafalotiseruw-sevabivinoxa-sujira.pdfIn PDF document text
    • http://tidet.dylanlouismonroe.com/uploads/1/3/2/6/132682168/melarimad_feloxogorew.pdfIn PDF document text
    • http://files.indygreencongregations.org/uploads/1/3/1/6/131606128/paxinezamikifod.pdfIn PDF document text
    • http://files.oursmalltownbigheart.org/uploads/1/3/2/6/132695306/2c408083ff.pdfIn PDF document text
    • http://wegapom.nwadventureguides.com/uploads/1/3/1/6/131606162/rufowok.pdfIn PDF document text
    • http://puvod.brosnacanacademy.com/uploads/1/3/1/4/131405927/xufoxugeziri_mapufunolazoxuw_tawomoxilibe.pdfIn PDF document text
    • http://furewup.jillamatong.com.au/uploads/1/3/0/7/130739935/6a759de476b85d.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/46e82038-a426-4f36-8b49-50aab939216f/99101650391.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_off00006748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6748 5620 bytes
SHA-256: 9ff8a94ed8cf879fc8b625252f25b40760d5e1f66d9c123466821dcd9128079c
font_01_sfnt_off00007a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5D 10324 bytes
SHA-256: 0927fa23afb6c30db4632fdf15253f19dc3497ce09223be3bc3e9305923da4d8

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