Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf4ddde17d7e1b6…

MALICIOUS

PDF

76.4 KB Created: 2020-12-06 11:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b0a9c1892d3e5562d09ccb5a12a26dfb SHA-1: 146f0d77c9804e809a5faa197df0398efc0ce2bf SHA-256: 8cf4ddde17d7e1b669d9ad263cf29797bc5ce37763d332b62927c25e9ab2b759
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=simply+christian+nt+wright+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5fbac06d7adcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fc601d31eade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_5fbb6ad7183e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fb7500d21985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_5fabe377d6d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f87163e365f8.pdfIn PDF document text
    • https://nakotibuvifotog.weebly.com/uploads/1/3/4/6/134619478/e456660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380691/normal_5fad4bb4d3587.pdfIn PDF document text
    • https://sifufunozomelu.weebly.com/uploads/1/3/4/7/134764248/9092508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f8e7b2c2806a.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/pazifetanegapu/doing_bayesian_data_analysis_a_tutorial_with_r.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/gliere_harp_concerto_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/85281997368.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/judepovupinaneb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 5864 bytes
SHA-256: f357f9c6aa2c156f70efe101ac6d39d83786d42d1352395c7ad26b501b529cc8
font_01_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 11648 bytes
SHA-256: ab1a41c880f54210c673976a0492b24027462d71aae391c3733d912d6e6b931a
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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