Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd39895c420b225f…

MALICIOUS

PDF

41.2 KB Created: 2020-10-04 10:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8c76b02e7a0fb4f776b673355bd3dbd1 SHA-1: b4663f6be64cf391c81680a7cbb0c8965a459c26 SHA-256: cd39895c420b225f9dd7de550ecfcd7d5fab2e51f6dba7e804f2bbdd77f69314
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=adobe+acrobat+apk+mod In PDF document text
    • http://digatoju.thebraider.com/uploads/1/3/1/4/131437987/6111243.pdfIn PDF document text
    • http://files.spiritandsageshop.com/uploads/1/3/1/4/131482832/mesegirela.pdfIn PDF document text
    • http://muvum.toronto-dialabottle.com/uploads/1/3/0/9/130970023/6152040.pdfIn PDF document text
    • http://files.beverlysoll.com/uploads/1/3/1/8/131872303/papolasabosur_furitotejaje_pujejejumod.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/1/0429/9735/0554/files/sunudulukimag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7352/8223/files/fly_2_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4335/6825/files/singer_industrial_sewing_machine_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6217/1550/files/wifafevanikapidijudoduz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0104/0024/files/78870750601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c5b110-0154-4d90-904d-63307fa5d43f/dezesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc5b84d-13cf-4497-98a3-57ac7328392a/tamufevekidubumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd31a41-6268-44e1-ae10-af50a24fa083/97490832652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd62e82c-e6e5-47ec-95c0-09b9efab4a29/runaselurutukupore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1297277-d665-4eb1-9ed3-97c75e3f572c/68200422892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2533612-0fc3-4094-b522-86b5a1ecc00c/19996804020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253f9bce-5dd6-4f35-9802-1a7bd0f8dd71/81478587155.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_off00006438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6438 5204 bytes
SHA-256: 5fbcee94760afd2afb1db560379ddb24d2003d8ea97550762d37df93fef9ad93
font_01_sfnt_off000075d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D5 10000 bytes
SHA-256: 16a8f22de367743426a34cc877d1f7e28e6a56e1e0a494a561ce2fa35cdf0559

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