Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ceabfdfc60f165…

MALICIOUS

PDF

49.2 KB Created: 2020-11-06 02:42:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 75d7c32733fa0f30bc1d6a7222c01bd3 SHA-1: 60f0b361bf74382d1299629bd7bbbbef523f809d SHA-256: c4ceabfdfc60f16552788eaf95115f769d88f30c0ada6d96daf2c540e748a1e8
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?keyword=dark+souls+remastered+save+editor+xbox+one PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5f975fd425a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f8bbf5556cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5f98cd8029f46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinabom/35816410407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7618e1c7-5e2c-4fcb-9191-752bb16f74a6/lerutarununavomotebad.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/creative_writing_prompts_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a16d596-1806-48b6-b89e-f89eca30ad6c/wanexafe.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/82987177562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d6ea10-a961-47cf-b5e8-a300c4737631/wejujajilesujokamapamez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e731560e-ab80-4ac6-8295-713e2c792fa8/ruseru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7364/1379/files/movimiento_circular_uniformemente_acelerado_ejercicios_resueltos.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_off00008290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8290 5304 bytes
SHA-256: 32ec8ff4cbf1cc382f58eac7061cc0a14085961a2c458df242ce561159e18a73
font_01_sfnt_off00009492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9492 10276 bytes
SHA-256: ea1514c76768fda44d48100cad9489c9e0e1c1a67ea13bef358a660ace543801