Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a591f7e8c34ba87…

MALICIOUS

PDF

42.4 KB Created: 2020-10-30 17:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8b46fc8aebfe384bfd5f2c838f854bce SHA-1: 9270b47fcc07454fb464bbef90e4ed0835ea2012 SHA-256: 8a591f7e8c34ba878d8f91c235e79bc585280497560e1a143d19a6c0cf4403e1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, includes the same URL and a large number of other PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/123?keyword=what+is+the+process+of+dissolving+bone In PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/09864a.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/rotudosegovape.pdfIn PDF document text
    • https://tobuzedatenet.weebly.com/uploads/1/3/4/3/134322281/2209651.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9599/3754/files/tikewuzulifadimopalom.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/javezoxomedobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f31432-f532-4743-8c95-841534abcd32/can_you_use_chromecast_with_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7757/5855/files/resumen_de_yurupary.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/42485780897.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/24210848642.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/1405/0720/files/schaums_outline_of_biology_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/44852175708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cb14a8-1d7f-4c24-a9a4-5f975d3348e5/pabewarerudiramapife.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DB 5632 bytes
SHA-256: e508d43ae7117e6635f1c0628d80263596ebe9f9ae5ef82cf3181a9319b2ba99
font_01_sfnt_off00007a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A08 10188 bytes
SHA-256: e1f5b4d4b6efb1af2cdcadf4b9eebecce20ae5b8dd49e6bd1475b8d5b726ebba

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