Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4c2577e37f45ca…

MALICIOUS

PDF

46.8 KB Created: 2020-10-15 20:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: de18c7fdc2fccc14b2435b68c3b8e6cf SHA-1: 6ce6272943642d5b897f9b78faef0ffe29172472 SHA-256: 0c4c2577e37f45ca1d20dd9663b249a655d4c93be03824310b6f32f6dff1771d
142 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.
  • 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://cctraff.ru/strik?keyword=kd+campus+aptitude+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f887c07bd391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f872d7a1cf58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f87ef1e892a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f8754b30d5ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f87f75ff02c8.pdfIn PDF document text
    • https://site-1040164.mozfiles.com/files/1040164/tugirusaguvewoxijusazes.pdfIn PDF document text
    • https://site-1038733.mozfiles.com/files/1038733/24600411813.pdfIn PDF document text
    • https://site-1038397.mozfiles.com/files/1038397/29786709083.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/61788276977.pdfIn PDF document text
    • https://site-1043314.mozfiles.com/files/1043314/siteraravibevewojoruzipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8723f6e7d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f881fbfd8966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/7065/5418/files/63647740354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0863/8106/files/rebutuvonatelabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/making_ethernet_cable_splitter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0472/3130/3845/files/52485915233.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9714/2936/files/sofa_legs_lowes.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_off0000619f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619F 5344 bytes
SHA-256: 7c265fa07471c3b0c245c8f0c12037e3ee49fa6e43ee8d8e2cc8add48c2d8e16
font_01_sfnt_off000073b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 10884 bytes
SHA-256: 9e6683de32f7967e35bf5260c9e0223ff6ec74c33daf67b4ecf2b9f4d9cf8ba8
font_02_sfnt_off000098dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98DC 5772 bytes
SHA-256: 9c4e237a4ea741820379059a035f862012713d8d96f2580ec5e10da127723e5c

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