Malicious PDF — malware analysis report

Static analysis result for SHA-256 54859ca70c4a82ab…

MALICIOUS

PDF

45.1 KB Created: 2020-09-30 11:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c2412d028a9630b94c366d41152c6ced SHA-1: e7d8e20f2deef0eedcf93a28ac9f436430463028 SHA-256: 54859ca70c4a82ab6bfc4715cf41efc7294e5ae9819b4ccb68b9796bfd292582
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms hosted on disposable domains. The document body text, though partially corrupted, includes a URL that is also present in the heuristics, indicating a deliberate attempt to direct users to external, potentially harmful, content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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=agenda+docente+secundario+2019+pdf In PDF document text
    • http://jolefine.nvintl.com/uploads/1/3/1/0/131071157/2775788.pdfIn PDF document text
    • http://tukemas.chicafoundation.org/uploads/1/3/1/4/131483418/3641355.pdfIn PDF document text
    • http://tosez.flipbookpublishing.shop/uploads/1/3/1/6/131606162/9c01b3b.pdfIn PDF document text
    • http://zegafo.jeffswaterconditioning.com/uploads/1/3/0/8/130814591/012b5f3.pdfIn PDF document text
    • http://vinona.williambmusic.com/uploads/1/3/1/3/131379737/pizawug-luguxisi-dijugedegof-podul.pdfIn PDF document text
    • http://suxaro.allysonboate.com/uploads/1/3/1/6/131637308/zosaxopanabigatoxota.pdfIn PDF document text
    • http://files.jessicaadamson.com/uploads/1/3/0/7/130775379/paxapebijuxex_nabuputafa_toworukupa_vumovenuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006af1.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006af1.bin)
    • https://cdn.shopify.com/s/files/1/0436/0306/7038/files/wwe_2k_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/pobalilexugoxeroluxiwuxid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/why_was_ace_of_cakes_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5519619-2de8-432a-bbfb-073a3f0417be/23853741161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d78942-2f79-4007-9589-416ab7a62102/dazurib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682e6c86-8ccf-4fd6-9432-992205dec5db/56646371662.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 extracted file (font_00_sfnt_off00006af1.bin)

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF1 5764 bytes
SHA-256: 449b669ed19ce70fe59e68f3b9787d04b96c12a594b7139544d92e6b6c9472d3
font_01_sfnt_off00007ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA7 12256 bytes
SHA-256: 8a1d9b6c5c49500ffcea2f9704ca51a1f8ff602bb36346995045c47aef94b40d

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