Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc214a52d4c515d9…

MALICIOUS

PDF

34.7 KB Created: 2020-10-26 13:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: df0a46d8944e52e875a499bff0d28e6c SHA-1: 97e608fd21a3f72300f3c9f0a4df7df546361689 SHA-256: bc214a52d4c515d9d61a721783e43e002d0efd6bca25e7dbe37b852ce8ca3950
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body text, while appearing as a search result for 'Pradeep chemistry book class 11 pdf', is likely a lure to encourage users to click on the malicious links. The ML classifier strongly indicated maliciousness, and the link farm behavior is consistent with SEO poisoning or phishing campaigns.

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://ttraff.link/123?keyword=pradeep+chemistry+book+class+11+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f89d26616fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5f8d1ce370077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_5f8f8aa2167d8.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/girituxajut.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/fuseni.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/927dc5cb922.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/kafax_pukexojef_fikiruse_wibefoti.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/3215642.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/5b04ca83cc.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/nobapabepo-jisukotez-vugaletate.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/b166203bc99.pdfIn PDF document text
    • https://gemiwanot.weebly.com/uploads/1/3/4/4/134495393/f3b9229c5267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f873df5a5a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f94cf561a743.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/b12460ee-71d1-448b-aad6-c576d6e4abb4/baxojorosodilape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b63849c-3c0c-4662-86ae-dc582d2edea7/verupegelekop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0119/1063/files/7_8_as_a_decimal_fraction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1701/3912/files/jazujafexakuzazov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7563/1780/files/46417871188.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_off000047f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47F4 5756 bytes
SHA-256: 240ad0163d3eca27ebc9d519c166a860d8ae85e0c6957510782a1363a853bc66
font_01_sfnt_off00005b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5B 9960 bytes
SHA-256: 27803060167abca51e16eba37f7ed2f0cad7cce2b336537015a7ed76140e6ec1

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