Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e4612bdfe1df83…

MALICIOUS

PDF

34.4 KB Created: 2020-10-12 20:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68eed00e5bfc4a8f43087162c9862fab SHA-1: d513ef159408dc6d20c623d18a99169504e5ce9a SHA-256: d9e4612bdfe1df837edafca43b4c8a037b31d80ddaed82b3436c237c4e7a6aab
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Types of arthritis pdf' and includes the malicious URL, indicating a lure to trick users into visiting a harmful site. The ML classifier strongly flagged this PDF as malicious.

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://ggtraff.ru/strik?keyword=types+of+arthritis+pdf In PDF document text
    • http://jisazo.powerproductions.ca/uploads/1/3/2/6/132681352/7119650.pdfIn PDF document text
    • http://vuxupawe.nc2020.org/uploads/1/3/0/7/130739017/zajobiki.pdfIn PDF document text
    • http://files.kendrickdevelopment.com/uploads/1/3/1/1/131163751/zuxipeponudunoka.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/40483685271.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/xedinifumifasozoliwakufus.pdfIn PDF document text
    • https://site-1042092.mozfiles.com/files/1042092/babutasezazubapivo.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/fbd7476d-b684-46b1-8a1f-de0205080233/lunokipevuwasiboda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51905d07-26ef-47ff-bdc7-1919aa38f228/wimujuzulevujeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ae205cc-ca91-4cec-994e-be7ba3044ca5/6879812869.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9477/9051/files/81252198565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4298/2046/files/phd_political_science_northwestern.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/the_greatest_salesman_in_the_world_by_og_mandino_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/dark_souls_dragon_greatsword_early.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8067/9064/files/mojulakara.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_off00004969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4969 5148 bytes
SHA-256: f920faa91a5d4aa66030089f33443e717c61b39ad8ab3bd7623ef6e18593a975
font_01_sfnt_off00005aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEF 9964 bytes
SHA-256: 9ba7f8272a5a41d09f0a6879000a30eb44bc890e17dc4192b984cf89b14fbe88

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