Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefd63a47e4cd4c0…

MALICIOUS

PDF

43.7 KB Created: 2020-10-26 05:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: aa87c8fadecf7eeb8dd63b0e9178aee6 SHA-1: 258034c9cb1f68c5e8177a3c0b34c0ef08bcd567 SHA-256: cefd63a47e4cd4c012b7c50d4c1f57005b13c9084a7df73b3c60d3866513fb7b
194 Risk Score

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://ggtraff.ru/aws?keyword=makkar+ielts+speaking+pdf+jan+to+april+2019 In PDF document text
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/sigix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5f8e5adece6c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8aec893c238.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/pizivurapab/pazanifudoxakoratebug.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/47579675698.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/beethoven_piano_sonata_23.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/gorukunegufavenexidumed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206ae6e7-661d-46b4-8ed8-ba7ad491fc4f/zeribemorasaneze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488fdd50-45a6-4e60-82a7-ddf3c855392a/rutiruzekiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff81b5b-be69-4422-90ae-70158bfa9487/lifosimuxanidufutapa.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/anxiety_definition_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/bhagavad_gita_in_hindi_by_swami_vivekananda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d93951f-05e3-44f5-8607-2797743b8c9b/jumoriwenotolon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17799b8a-dcf0-45f3-a9e0-7438b303945b/70926629112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52f280e-95dd-4306-9e64-9e4d58e52d96/65249852730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a028324c-cb19-4b7f-83cd-567bca6c58a0/17135057206.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 5836 bytes
SHA-256: 145792fa13383e9e9bfa6785409e8116cf6457df7d77b6f80469cbe9e4b46f8c
font_01_sfnt_off00007320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7320 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00007e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E82 10260 bytes
SHA-256: ed90eb4ee2d6bc70c2701fec98c193fb6c7c0096ccd2bab3147d8fdb52001abf

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