Malicious PDF — malware analysis report

Static analysis result for SHA-256 414b1b9d262d0c1a…

MALICIOUS

PDF

57.8 KB Created: 2020-11-07 07:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 7c774fafe0457362563463b0483976a2 SHA-1: 382310c9b42a1737bf7edeb4e3bf071b7c42a4b3 SHA-256: 414b1b9d262d0c1a946ff4786039e31411c06da61a1f5225d4ba92ef05825d7a
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=storm+sorcerer+5e+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470545/normal_5fa3ca4a2250c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8b753e641d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f87497a89e06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/79058785270.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/cambridge_igcse_geography_coursebook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/english_syllable_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/numeboniditaritej.pdfIn PDF document text
    • https://xevibipujezi.files.wordpress.com/2020/11/the_education_of_a_value_investor.pdfIn PDF document text
    • https://zesibeb.files.wordpress.com/2020/11/metropolitan_achievement_test.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/tea_tv_apk_for_amazon_fire.pdfIn PDF document text
    • https://bipajus.files.wordpress.com/2020/11/ginojaxisasezuwovalotowe.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/demavitanulanoxuwe.pdfIn PDF document text
    • https://nogosipemom.files.wordpress.com/2020/11/new_manual_lathes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9633 5020 bytes
SHA-256: 52c58f0e0750116e190869e821ccc49bd43a581213b03ed19bfd1cd0059abf3b
font_01_sfnt_off0000a742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA742 10692 bytes
SHA-256: f64cb2103676675e017b3eb317933fb1b9e1263bbdfa113bf04a6d5f54e0523c
font_02_sfnt_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333