Malicious PDF — malware analysis report

Static analysis result for SHA-256 527d7e26c88f8092…

MALICIOUS

PDF

44.1 KB Created: 2020-10-10 06:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: f88d52b4e7b6407bc7dcaed5103a957a SHA-1: 967e7d3b1823797b07c2717813db607aed16f281 SHA-256: 527d7e26c88f8092969a0d7d07e9f3d4b863d6af885f1ea0f7ea2576ff17d3ed
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=2013+scion+tc+owners+manual In PDF document text
    • http://files.chantalsboutique.com/uploads/1/3/2/6/132681556/jinogomememenadudu.pdfIn PDF document text
    • http://files.fhbcofhartsville.org/uploads/1/3/2/6/132681910/pixalazunumonez.pdfIn PDF document text
    • http://files.westchesterswimconference.com/uploads/1/3/1/3/131381540/wukofinejo.pdfIn PDF document text
    • https://site-1038849.mozfiles.com/files/1038849/xixamoxezukosu.pdfIn PDF document text
    • https://site-1039656.mozfiles.com/files/1039656/sirugasowuzaxurajujawajof.pdfIn PDF document text
    • https://site-1038634.mozfiles.com/files/1038634/57605708583.pdfIn PDF document text
    • https://site-1043034.mozfiles.com/files/1043034/tumojubilisidi.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/kelekekonikadizo.pdfIn PDF document text
    • http://fedebi.indianlandsocceracademy.com/uploads/1/3/1/3/131381658/f105889d.pdfIn PDF document text
    • http://files.osmint.com/uploads/1/3/2/3/132303282/5803130.pdfIn PDF document text
    • http://files.alcyonepsy.com/uploads/1/3/0/7/130739525/nuwujenep_buwinuvukolin_zufegi_jomofo.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/1/0482/0674/1658/files/garmin_fenix_5x_manual_svenska.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5175/2344/files/25777132303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6105/4106/files/rijoraxixaranetuzorusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3114/6908/files/vale_middle_school_reading_article_how_the_most_promising_hoverboards_actually_work.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/trojan_horse_allusion.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58F3 5432 bytes
SHA-256: 6a412ec3e466a0c8038675ca2a45d6364acf88f504a99c7a69cf2d03b85ef7a9
font_01_sfnt_off00006b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B64 10264 bytes
SHA-256: 28e2fd1a19a93a7aa5afa3cd660616909bf311ee2a68323a94604e89d6c52f57
font_02_sfnt_off00008e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E90 16060 bytes
SHA-256: 1a51fac5cecc05d5f0a5d3b698ffe240ccab470cdba6a823ba27c6c2a12c20dd