Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f9bbab2a856093…

MALICIOUS

PDF

39.7 KB Created: 2020-11-03 13:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0dcf747c5a28a24f3040f5ab3df3103f SHA-1: 8e9d3b02a7855ec2f640e5eadbbca720e5ae3d40 SHA-256: 51f9bbab2a856093e61273a5ca2c94821149b5b33b1a134d07244e6b04e08b04
194 Risk Score
Tags
free-cdn-ebook-manual-lure

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 a redirector URL associated with scams. The primary malicious URL identified is https://cctraff.ru/aws?keyword=discord+nitro+gift+bot+scam, which is likely used to deliver a secondary payload or phish for credentials. The document body text and heuristics confirm the malicious intent of redirecting users to scam-related content.

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.
  • 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/aws?keyword=discord+nitro+gift+bot+scam In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_5f9208f020969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5f9da821b9a3e.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/ea180ab19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f942f367b73f.pdfIn PDF document text
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/9544892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8d15a8c205a.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/jotizifime/a_first_course_in_abstract_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/35710455803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc3b07b-3d50-4a54-889e-61a13090d0da/96369100976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23967b0b-ea63-4580-a1c8-0d4278edd823/5141140569.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/ayurveda_books_in_telugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2069/5742/files/35746327779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b18af48-dcd0-42fe-99fb-229f8b0a00d1/manual_total_gym_1000_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c8af0c9-c66d-4d53-89b8-42ba97243843/jemaximi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90c6b43-6e21-4125-9c8c-47ac51eafc40/descargar_emulador_de_xbox_clasica_para_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7536/8628/files/can_ms_cause_kidney_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/algebraic_fractions_test.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_off00005ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA6 5448 bytes
SHA-256: 20519944d04c2166205f0658982cf10969d7257eb9d1e50b433ebe7a5bcb1342
font_01_sfnt_off00006f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1E 10348 bytes
SHA-256: 6d6af8b66ea9491c76e91e96342644112e2dd31cd4940e2bd73c54c8d59f740d

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