Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbcb5b647fb878a…

MALICIOUS

PDF

45.6 KB Created: 2020-10-05 12:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ddae1939173416483ba53cda8e3a8a46 SHA-1: 1bf3459ceed0e7fd3ba3597163bb8b582a4e1265 SHA-256: 9dbcb5b647fb878a1b8d9bf1e7d5f320081246427dc094771fae867cb7216ed8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and one of the primary URLs is identified as a known malicious redirector.

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://ggtraff.ru/pify?keyword=rift+guide+summoners+war In PDF document text
    • http://files.qualitymulch.org/uploads/1/3/1/0/131070894/8160473.pdfIn PDF document text
    • http://ketuv.aldorle.com/uploads/1/3/1/3/131381658/e2f1f636f8.pdfIn PDF document text
    • http://files.orderbrewtoledo.com/uploads/1/3/0/8/130874633/mugupisagalofoku.pdfIn PDF document text
    • http://files.conbeersfarm.com/uploads/1/3/1/6/131637140/d68de.pdfIn PDF document text
    • http://files.keelestudenthouses.com/uploads/1/3/0/7/130776133/vudowotatodubuxi.pdfIn PDF document text
    • http://files.inezthreadz.com/uploads/1/3/0/8/130874180/kexavanimava-dalagek.pdfIn PDF document text
    • http://files.airdriekarate.net/uploads/1/3/1/4/131407263/6f389.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/d8e2ea3e-0665-4671-ae14-c176954157b1/mopusedolufiwexoxoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115e7026-d86a-40db-ac2e-41b4203669c7/xuxarodufivamuridorabogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c280be4-f8b9-4051-bd60-bcada4f7d324/kuparirewaxamagipeviboxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e65a0dc-79e6-4b87-a5fa-2ad55e948e66/xetexobifebazos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8843/6118/files/elan_justice_pavlinich.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7703/0054/files/ninarozopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1148/9959/files/subojidesumemibopotulel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9420/0487/files/sony_remote_control_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/2451/5989/files/what_words_that_start_with_ne.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_off0000730c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730C 5296 bytes
SHA-256: 9386004bd162a0371a5f741b3e69361a265ddef92fc4ee54db4576d6397f3a32
font_01_sfnt_off00008513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8513 10984 bytes
SHA-256: e2467f3a9934c754b17a2a58e0f4cdae84d9fca08cfe39691c8c98634f941e67

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