Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c900782c6351e40…

MALICIOUS

PDF

133.5 KB Created: 2020-10-25 20:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 03dc13ddf76ed4840e418ab1639de79c SHA-1: 90f4731a88b5306767986911e446e3d748ae9742 SHA-256: 6c900782c6351e402cb06b031dd06702ef5dd8acbad57384ef03e21436e3f5b4
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 0.9999

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://cctraff.ru/aws?keyword=basic+electronics+by+b+l+theraja+pdf In PDF document text
    • https://nifadajenekipib.weebly.com/uploads/1/3/4/3/134305148/15497eeeb1192.pdfIn PDF document text
    • https://ponixojezunuto.weebly.com/uploads/1/3/0/9/130969897/molurapexa.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/c78f845f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5f94716d8045a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f8fcd58c0d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f8b3a8f4abb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f88b89ba091d.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/henghuili-files2/spontaneous_abortion.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/article_all_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/zinedatagufipetiwakinaz.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/que_es_la_atmosfera_de_la_tierra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efcf3098-c6be-4019-8def-2bc94b5c9914/larikovux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4903/3114/files/16244969658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/difference_between_purple_and_violet_light.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/1834/2559/files/morel_mushroom_hunting_season_wisconsin.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_off0001adc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADC1 5612 bytes
SHA-256: d3a992935f9202f25beb80a40e29f220e929e27de86d6e12f8704691a4da62aa
font_01_sfnt_off0001c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0C6 15100 bytes
SHA-256: 44e0fe47a27ea2c9d36130505ed5ef0ba6bab2d5e7363dcb2937baa2df4bf855
font_02_sfnt_off0001f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F28F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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