Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67e9d890a19cae1…

MALICIOUS

PDF

43.1 KB Created: 2020-10-30 06:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b237c68ef0b2182163223517bfc0f97c SHA-1: d5f6f4ce61abe63245b16e51140ac3b496f21261 SHA-256: e67e9d890a19cae1dd37110c82766b6c1fd05ba1aad1e8baeccf9ff96b7dd8a3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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=persona+3+magician+boss In PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/tujakigufemufivo.pdfIn PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/7908035.pdfIn PDF document text
    • https://rujovisaz.weebly.com/uploads/1/3/4/3/134328318/penakowajinif_baxifidup_vekepifaw_munemibexav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f90d4038bc18.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/tevapasikizibi_sefoxerav_xuxixavoganafim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f9678e2dd7bf.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/472ca9225f78.pdfIn PDF document text
    • https://fenibelamej.weebly.com/uploads/1/3/4/4/134464240/zizitegowojaxajada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f90f19f1c8dc.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/1/0502/1060/3177/files/what_to_do_when_your_bored_at_school_and_have_nothing_to_do.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7934/3519/files/servo_u_manual_svenska.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_off0000668c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 5392 bytes
SHA-256: ad1ac57ba4829d3aee64c3cd5e633e8791e61ae0cf3caa9a0c04d8f7e010f592
font_01_sfnt_off000078ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 11612 bytes
SHA-256: 1b949aa9f341a7cdd32a291e1190f62ea8bdd0dd746153e9749dae2d8d9fc28b

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