Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a137673e49e8022…

MALICIOUS

PDF

44.8 KB Created: 2020-10-10 10:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 78c5a2ce7312328ebc28947fcbec29d3 SHA-1: 72783193f9a6648ef3dd31ead32af2274fb5e6e8 SHA-256: 4a137673e49e8022df930412f57fa8387f8661655cd64e4fd4c300e32944fb85
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.link/pify?keyword=spiritual+warrior%2527s+guide+to+defeating+water+spirits In PDF document text
    • http://putiti.mtm-inc.com/uploads/1/3/1/1/131164250/muvogafesufav.pdfIn PDF document text
    • http://files.twf-solutions.com/uploads/1/3/1/4/131453215/rubikone.pdfIn PDF document text
    • http://wawiko.taistar1.com/uploads/1/3/0/9/130969634/makupotojekinap.pdfIn PDF document text
    • http://nabop.treeservicekingsport.com/uploads/1/3/0/7/130775403/7189224.pdfIn PDF document text
    • http://files.pdflowerfarm.com/uploads/1/3/1/4/131482926/1fefcf0.pdfIn PDF document text
    • http://fozuj.schaefernursery.com/uploads/1/3/1/4/131453048/8891236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/827d60ce-2301-4dc2-b447-4bd9d115fcce/51142804116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58789d25-e9e6-4e00-af36-3af01f916ea9/93958256737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09f4748-cde5-43d4-94ac-0981090009c7/jamafemovuwazawek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c756af48-ef57-4aca-b609-34b92f7787eb/luzajadaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85342092-5793-4f50-82d6-5dfc9adcb425/9733349248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665bbf35-476c-40b3-ad24-ccdde98ca088/35529932414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303601e5-d013-4a6a-ad8e-7019df416f17/xufavovukegogipun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 5320 bytes
SHA-256: 6b843ef8c9259077095589532e364092d864de0d0aa6712fbd5e7adc561c4bc4
font_01_sfnt_off0000741d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741D 10628 bytes
SHA-256: a350078d9428a517d4d38b9b5928ec7e7c3b77f6ee03865e3cb9fab61ef070d0
font_02_sfnt_off000097e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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