Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f5e294fc14ca88…

MALICIOUS

PDF

48.3 KB Created: 2020-11-01 23:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4fa3d3bb416798839e9d7380d24b6f12 SHA-1: 318d0e36505983aabec47e090dedc790f16c428d SHA-256: 10f5e294fc14ca882b268bd86806fb48f5f5a787ef6f79bff4f720f06115f847
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to host or serve a malicious payload or phishing page.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=hot+toys+noisy+boy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f9156c0dab4e.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/250361.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/mivomedabubos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f9ad38094c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8a10158d33a.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/kelekiferek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/banking_awareness_book_arihant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bff257-8b20-4158-b9d2-3a0f6205e70b/121216897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f376ea-9f9b-435b-96cc-862e8742217e/retexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0996/4694/files/samamozivopifamurogakejug.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/engineering_thermodynamics_by_rk_rajput.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_off0000814b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x814B 4544 bytes
SHA-256: 15d7a5df4b1aec8796d4aa4b71d1444740c0b740709d19e9cb73b5f0fa5ed14a
font_01_sfnt_off000090d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D9 10436 bytes
SHA-256: c962f03ad99ffc71df1030ceb4ffa63261231f6c51690d244f353d4608f7faf6

Open this report in the interactive analyzer, or submit your own file for analysis.