Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e47e11682ec444…

MALICIOUS

PDF

63.6 KB Created: 2020-10-04 02:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9e797a9c53144dd7850b47c49f0b8e04 SHA-1: fdd604569377823567c2dda482f11d480559af0a SHA-256: a9e47e11682ec444767ba9df23a6ac0a8daa2b4fec0d10ad8052b5336342c239
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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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/pify?keyword=types+of+linen In PDF document text
    • http://jadipul.perfectstrangersdeeppurpletribute.com/uploads/1/3/0/9/130969503/63287737a.pdfIn PDF document text
    • http://zixaw.spirithorse.net/uploads/1/3/0/7/130739693/f7066e.pdfIn PDF document text
    • http://files.authorlmendez.com/uploads/1/3/1/8/131858661/luwaju.pdfIn PDF document text
    • http://files.nurismailphotography.com/uploads/1/3/0/7/130776035/diresutewexemene.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/9b46e7b2-6557-4903-a09c-9d67b145ad89/68452911465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04d4e287-a9f2-4c5c-a72c-34b47b657cb1/27185306229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec4f7ff-1cb1-4dfb-bece-e053802561e9/70998440534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80477e61-5646-422a-b740-8ae74b115fa2/pidivoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661a8fda-ae3e-42e1-8bdc-3a5d9d4809ff/37002658111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d54e89f-0751-4902-987a-12643e1730f1/vulebojoboborov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2fc97c-9edd-474a-8166-c8ce89fe9586/66205604845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b5d47d-41fc-4607-bbfe-628e48c1de34/janizonakikinifimubugur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764ae276-69aa-47ec-800a-fe670bd6c5dd/vulizufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf79fc2b-1b16-4308-9371-3a0255cc48ee/47268965979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/social_interaction_model.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/athens_drive_in_athens_al.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/walemetitok.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_off0000ba31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA31 4640 bytes
SHA-256: 0194f4dd270ff4b38290e5e20435fc7c41e28cba073d9a8aaa3633c2ac50f789
font_01_sfnt_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 11744 bytes
SHA-256: bbdcf3eb8111e098613dd4b0145f7a60466747859d51aaba2b75c120ee722133

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