Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a8fa85693b1382…

MALICIOUS

PDF

44.5 KB Created: 2020-10-31 06:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 34e267260ba21881c029a1c5d34c9680 SHA-1: c00edab1a5dce78e67b5018d6b6d4c735ce31f63 SHA-256: 54a8fa85693b1382856706988284d33709c01085cd6f327275256270107ed669
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/aws?keyword=songs+about+jack+from+lord+of+the+flies In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_5f95e6dc8cb31.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/lepixapazarowurabip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f8ceed842e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370280/normal_5f8dc43fd40ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006ed2.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006ed2.bin)
    • https://s3.amazonaws.com/napejaxosinages/dependency_theory_underdevelopment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/8842/1282/files/93100874816.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/91377476089.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/au480_beckman_coulter_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/curso_esoterico_de_tarot_y_cabala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3337/6968/files/26661326958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1594944-81d0-4e75-a494-b338cadde840/61506145335.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 extracted file (font_00_sfnt_off00006ed2.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED2 5816 bytes
SHA-256: 362f0696e720801c971a10f28c386d0a3a438300f2b9716d56bc07a2d5824a4d
font_01_sfnt_off00008280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8280 10292 bytes
SHA-256: f214072025f984dfd7f8c003d0f5a68a0c58d0dc154acd0ec29edee9e54ccb25