Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea81b79e09c68eac…

MALICIOUS

PDF

38.5 KB Created: 2020-10-03 06:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 0bbb794fbbdac6dbbb7bd873f2669c49 SHA-1: 9c254802d7c883ca7f77370c4063ceefb77d6088 SHA-256: ea81b79e09c68eac00f1367729c47bc0e29f685ab3c551e859cf44f0d7eda91a
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://gettraff.ru/strik?keyword=yugioh+duel+generation+apk+121a In PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/30098876909.pdfIn PDF document text
    • https://site-1042781.mozfiles.com/files/1042781/kiwawopijezejozixevekejok.pdfIn PDF document text
    • https://site-1036680.mozfiles.com/files/1036680/99901980664.pdfIn PDF document text
    • http://rirexo.beclitvan.com/uploads/1/3/2/6/132682989/tezosubipo.pdfIn PDF document text
    • http://files.pretoriawestmethodist.org/uploads/1/3/2/7/132740595/120022.pdfIn PDF document text
    • http://files.tandem-eu.com/uploads/1/3/0/8/130814052/2152773.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/24063721954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/vidakitej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5329/7047/files/the_body_fat_breakthrough_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/2859/3051/files/designhome_no_survey_no_human_verification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6593/1936/files/45822952062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0368/5275/files/75455501397.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/bullet_bill_1_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3835/0231/files/xosafexavubeponoruw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/9506/0383/files/18469846034.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_off000057d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57D9 5252 bytes
SHA-256: 653a5756f9fb62ad018626a532bb39342a23324b7d3795fe85204ee0b9d64581
font_01_sfnt_off000069b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B7 10364 bytes
SHA-256: 86e346e781a8ae141dfdd569c9143cc715a8b8c063caa563f1a1bb5afed9c5d5

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