Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d3b11bc2f0bc6b…

MALICIOUS

PDF

58.9 KB Created: 2020-10-05 23:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d3fd1e49d9115fc43e32303bb1b920a SHA-1: 952097a4968c61ed2132ff4806d2f220839b2d71 SHA-256: e9d3b11bc2f0bc6bf9855d0ec682b5c7a7f9d2474d45cc3891427c3557e71824
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm designed to direct users to potentially harmful sites. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=project+report+on+bituminous+road+construction+pdf In PDF document text
    • http://files.cornwall2theandes.com/uploads/1/3/0/7/130775310/9e42f41c295c9.pdfIn PDF document text
    • http://files.asahionline.com/uploads/1/3/0/7/130776504/tebefi.pdfIn PDF document text
    • http://buwabe.iwanderwhy.net/uploads/1/3/0/9/130969186/ruxuw_berifoforopoxux_pamavejewow.pdfIn PDF document text
    • https://site-1037273.mozfiles.com/files/1037273/48627724099.pdfIn PDF document text
    • https://site-1038360.mozfiles.com/files/1038360/85838687419.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/36273356182.pdfIn PDF document text
    • https://site-1036798.mozfiles.com/files/1036798/25949386750.pdfIn PDF document text
    • https://site-1036750.mozfiles.com/files/1036750/sutudumubuforizatifavofo.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://cdn.shopify.com/s/files/1/0482/9436/3297/files/botanical_line_drawing_peggy_dean.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/seasons_worksheet_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4136/3870/files/what_i_know_for_sure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6864/8343/files/nikka_zaildar_2_full_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89757e57-9b5d-41a8-92b1-fae292b43ca8/kafugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def812dd-1309-4520-ba36-b16c75e75bfe/79972092334.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_off00009a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A88 5368 bytes
SHA-256: 2360f7c5bc0a2a3950e4ae6dc5efe9ec236fa88f124c7e3dbd081acfd834c363
font_01_sfnt_off0000aca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA6 10376 bytes
SHA-256: 42f0ef23243b56436f1fa43368231f690a055e745fff13be6b8c609db72d5435
font_02_sfnt_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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