Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e904c723705485…

MALICIOUS

PDF

41.0 KB Created: 2020-10-05 21:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c862103c8ce03afec3281c5c89082824 SHA-1: 9ebeae5cc678c4557a344747dfea5f9cc1754d28 SHA-256: c7e904c723705485ff5b1a1dd07562b498c66257a917f83035cf28f4d37dbcab
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=prefix+and+suffix+worksheets+2nd+grade+pdf In PDF document text
    • http://files.canyoncitygrill.com/uploads/1/3/1/3/131379434/xezutipokobil.pdfIn PDF document text
    • http://files.bainbridgelabradoodles.com/uploads/1/3/0/7/130738759/e81b5d9.pdfIn PDF document text
    • http://files.armourofdeus.com/uploads/1/3/1/3/131379456/nazoxow.pdfIn PDF document text
    • http://files.somonaukfire.org/uploads/1/3/2/6/132695329/misisiba.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://uploads.strikinglycdn.com/files/ee55db46-6010-4e8b-bde8-57702c2cbc5e/givivasaluvalunolewurewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c5d0db-c74f-4768-8d0a-c174b2da5949/rukopidadiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f28433-9944-4512-a362-d95541d07958/lukafurunix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae559e6-fc8e-4bd7-8264-a6b49c689f0a/jipamovexonapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/8322/3206/files/codigo_de_seguros_de_puerto_rico_seccion_41.50.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/marriage_zone_graph.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/43025162250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4291/9832/files/revlon_colorburst_balm_stain_swatches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d636b8f-e6e8-4cae-9bc0-55c3207e4366/33519674638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185eca04-a5d7-45dc-9605-545ba050dd3c/ladasemimif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da782fc6-4cea-4038-8111-85977a85dd04/xofine.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_off000055db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55DB 5508 bytes
SHA-256: 5f133aa9166fc87c0acfdc33b27bf375e011ec162546e524ef6dcd9f82c2019e
font_01_sfnt_off000068ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 9392 bytes
SHA-256: 823ca4fe84fee424a3b46ed64439e5b708afef9ecd101afb204ae5c4533a0bd3
font_02_sfnt_off000088d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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