Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4ca98e68509105…

MALICIOUS

PDF

42.8 KB Created: 2020-10-12 18:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 44947952ab2d0653587e778fc3200442 SHA-1: aea571483795b3e4b452afc202ff8c735aca0c32 SHA-256: ce4ca98e6850910529acf91c82850974faf9309adcbfd5e5f4b91887bf5d54af
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://cctraff.ru/strik?keyword=south+australian+spelling+test+b+pdf In PDF document text
    • http://wuviwoge.int-rec.com/uploads/1/3/1/3/131398372/vafisupokuf.pdfIn PDF document text
    • http://bebuvawa.summerfry.com/uploads/1/3/2/6/132682137/zarikidududexategomu.pdfIn PDF document text
    • http://files.al-anonny.org/uploads/1/3/1/4/131407668/bolofa.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/27733203808.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/bilunikusuvaxomig.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/1/0434/3152/6557/files/mowivazixuxoloxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4228/2906/files/84181768651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0406/8516/files/ap_biology_exam_review_packet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/roxbury_high_school_address.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/introduction_to_thermodynamics_and_heat_transfer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4110/7353/files/terikumilarulofina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/composite_figure_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/60111291669.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_off0000687d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687D 5548 bytes
SHA-256: adce30859dff48f4b77e1df9933e64078abe80e9a465fbca5762e88623bdaca3
font_01_sfnt_off00007b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B45 10260 bytes
SHA-256: 9c185bb9991ad6412af60020dee3017679bca4296bbe130842cf502e56b59944