Malicious PDF — malware analysis report

Static analysis result for SHA-256 add229dc2f25d0cd…

MALICIOUS

PDF

51.7 KB Created: 2020-10-01 06:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b39b36a8c678b9110d1747133dae689c SHA-1: cb4284f8d1ac618b7d67e76fa43051b26cd066ad SHA-256: add229dc2f25d0cd128f6b97eeba98900673fe412754125305537522c409e07a
184 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, with heuristics indicating it is a link farm designed to distribute content or potentially malware. One embedded URL, 'https://gettraff.ru/strik?keyword=carbohydrate+metabolism+pdf', is known to point to malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive use of external links suggests a phishing or content distribution scheme.

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://gettraff.ru/strik?keyword=carbohydrate+metabolism+pdf In PDF document text
    • http://files.teamgerbs.com/uploads/1/3/2/3/132302910/folekelapelu_gajefowi_narubasaderevaj_fubojif.pdfIn PDF document text
    • http://files.kpeggphotography.com/uploads/1/3/1/4/131437064/68c4f2edbe8048a.pdfIn PDF document text
    • http://files.precolumbianjewellery.com/uploads/1/3/1/6/131636988/2924956.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/46813713181.pdfIn PDF document text
    • https://site-1039201.mozfiles.com/files/1039201/56806467025.pdfIn PDF document text
    • https://site-1036743.mozfiles.com/files/1036743/51730158253.pdfIn PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/juzetixomaxupide.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/96fd7269-d6eb-4c64-ab50-24106b706058/mudanafavesapijivijit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71686566-461c-4008-af48-50709fe3a5f5/waredifokum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0332e657-7935-45da-8933-2a1251d3aa09/bivoragerod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a8b990-3d08-4215-8ca2-fedfc414f40a/40099048465.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_off00008d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1F 5428 bytes
SHA-256: 8dc0a4c0e90c5ae9177505081cb255f63cef17233f8f7766fb559b80032e2d97
font_01_sfnt_off00009f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F68 10116 bytes
SHA-256: 0cb62bd0b8c1e0fb503c604d765f8f8d4f4243d045555c4727bc87384d671d88

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