Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61872c3cbc4e0db…

MALICIOUS

PDF

69.5 KB Created: 2020-10-15 11:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4ddb8de46fb8d00f6ac4b9ee12c9999e SHA-1: 6ac8b83cc3381175aac6d6b541429713d41ea26f SHA-256: b61872c3cbc4e0db51a8e0c54868670d03762d91da074f03abba70c8df431064
184 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results. One prominent link redirects to a malicious URL that appears to be a lure for downloading software. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized links suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=sublime+text+apk+download+for+windows In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1158663.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/xidifopukexarevig.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/b900d9732f233.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/0bb9c02eeaab6a2.pdfIn PDF document text
    • https://site-1041677.mozfiles.com/files/1041677/jejazitubogixodelifuviram.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/80781973805.pdfIn PDF document text
    • https://site-1036713.mozfiles.com/files/1036713/90036946691.pdfIn PDF document text
    • https://site-1043405.mozfiles.com/files/1043405/vugoti.pdfIn PDF document text
    • https://site-1038890.mozfiles.com/files/1038890/98689776315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f87c849e83c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8753f08f062.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/7ef04787c1.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/jivemurajipu.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/2651808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f8748cea2dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f875ba4bcd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87fecc0fc60.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/1/0484/5597/5062/files/98725757901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5460/2658/files/quick_ball_pixelmon_wiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/fallout_3_fwe_skill_books.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_off0000cdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC6 5656 bytes
SHA-256: 3ae1bd8c9e66f95d64b5dc2c274c30e6d6398d40e5ee43cb2631301def7136fe
font_01_sfnt_off0000e103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 12204 bytes
SHA-256: ff2abe5f8071e6945ccd21cb799705c6987a8e169da6520142701e702becfdeb

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