Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5802be6ac6802f…

MALICIOUS

PDF

46.2 KB Created: 2020-11-04 11:25:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d519bed54a2bda1616fe0ddfc0e8bacb SHA-1: b66717db4d1a376bbf2dd5aa35718cc3c2e31a4a SHA-256: 6d5802be6ac6802f782d0bfe74e238507b8e143e2aa437935c7bb4daccf63144
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://gettraff.ru/123?keyword=big+bang+empire+mod+apk. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links suggests a watering hole or phishing-like attack vector.

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/123?keyword=big+bang+empire+mod+apk In PDF document text
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/2204663.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/daxipinepejul_pesev_wefovi_bexawobawu.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/485d9f27-aed1-4e9b-b477-2a66fe631b09/santrock_essentials_of_lifespan_development.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/reba_tv_series_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb4917e-3df9-4f68-91fa-8e930b874d9b/burn_sideboard_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fe9671-55aa-499d-ad20-bb63482a67c8/file_repair_review.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/angaraka_stotram_in_sanskrit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02989107-520f-472e-84a2-2256b20a5888/9058374276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9cf6c7-49ae-471a-ba16-de7b11ebd00b/99725156486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9399406b-e8c3-48c6-84ff-1600cbb447ec/wutubat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b98ce41-0634-41c9-886d-1caa2d08f5d1/judging_from_their_basal_metabolic_rates.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/encode_to_base64_angular.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_off00005f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2C 5324 bytes
SHA-256: e585b51dcb8af7cbb5a77ba616a216a21a7a01308c43287d31b8dc7fb3724fcc
font_01_sfnt_off00007130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7130 10924 bytes
SHA-256: 77b96857d6a017a8a07855e702ba0ded19bc82a933af8616a3b1dea04989a587
font_02_sfnt_off00009690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9690 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b

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