Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cede9892055f6bd…

MALICIOUS

PDF

40.6 KB Created: 2020-10-04 17:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 3c638fd3241dc08c97f65555f0f82861 SHA-1: 6a3ce6d17af99e9730699a030286e71dc82c7954 SHA-256: 9cede9892055f6bd9112384124279f8dccae12c0efe9ec725375f199086ae9ad
234 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=excerpts+from+romeo+and+juliet+answe In PDF document text
    • http://files.gtgtech.org/uploads/1/3/1/6/131607438/77358.pdfIn PDF document text
    • http://tukem.duoclarinetshop.com/uploads/1/3/1/3/131380942/1754b1.pdfIn PDF document text
    • http://files.mrsmccormick.com/uploads/1/3/2/3/132302939/vixudupe.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/geruzepopijuvilidufeb.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/xunal.pdfIn PDF document text
    • https://site-1039143.mozfiles.com/files/1039143/desuxovo.pdfIn PDF document text
    • https://site-1041591.mozfiles.com/files/1041591/pizemowijek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7b0858-eae3-47ed-a373-aa38d8441f95/68179202522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9d9e15-e550-4359-aeb9-01731618b853/dexewegivupivogijolimes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5712/1942/files/resume_en_espaol_sin_experiencia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2354/3715/files/holy_basil_seeds_to_grow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9122/9349/files/xotoperuzixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4557/7116/files/vapotatirasulijivubo.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_off00005f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 5496 bytes
SHA-256: 9e9860036033b1efee00dbfea1dcca90a88c1b845a7702f718b6022e6888e5ee
font_01_sfnt_off000071db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 10624 bytes
SHA-256: e6d67dbfd947901d12461ef022eee1d6fd2550f3c700518bd042ca46c52ec9cb

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