Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a057442dd3624c…

MALICIOUS

PDF

46.5 KB Created: 2020-10-29 16:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 895a8f9396d2d140dbfc42098e1de22f SHA-1: ea496d1cf85cd553fa2c23d3c93a8eae235969f1 SHA-256: 03a057442dd3624cf660cd65d4681c0b30206e45a6393b244141ee519a70cda0
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://ttraff.cc/123?keyword=algebra+2+direct+variation+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f8b4e04b8dd4.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/2af5d9cb-52f6-4e3c-aab0-3d5d74eabdfa/19107123630.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/mega_premium_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6e5ad1-dc28-4322-af22-a476d4e9314e/46631943685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948cde14-3853-46f1-9b2f-2421bd6ba619/34305020994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a250128-7da8-49a9-841f-aac75718802c/88730050135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72eb3917-f50f-4b9b-837b-c1772561388d/lewapakafufokumepedetidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4295dec2-7553-437c-b2a9-56d86bd7767f/9227887605.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9925/8022/files/13542774447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e451250d-58e8-4be7-809a-66fd1d1f3afc/60215639894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24d0269-631c-492f-b897-2999fb062be6/58779014846.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/folifefexogeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4dc7b16-75af-443e-9c38-76fcf8a30575/85444353118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96ab053c-645c-4a07-936a-40b382cb2de7/pimule.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_off000073fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73FB 5676 bytes
SHA-256: 9c86550e6618d2ebd23bcf78d759462a15b84a629f6ea8b1c7a2b0ef01e0208a
font_01_sfnt_off00008757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8757 11504 bytes
SHA-256: fd2e4fd5c71b434c043889d9ec21815a0b6a0c206ec5f92d91a311667c90dbb6

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