Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d89a37ba09972df…

MALICIOUS

PDF

62.4 KB Created: 2020-10-08 15:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74909dd12ae26c14ab742c85cd8e5c29 SHA-1: 79f514f9d0834c1d93d89886d2afd0ba4c09e515 SHA-256: 1d89a37ba09972df8c567a6abafd9e122060a7be1f4a1d17347d9567896fede3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector, indicating a clear intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/strik?keyword=st+patrick%2527+s+breastplate+prayer+pdf In PDF document text
    • http://files.secondwind.org/uploads/1/3/0/7/130740082/razope-tesegedolaf-sabixax.pdfIn PDF document text
    • http://files.bigfootcasefiles.com/uploads/1/3/1/6/131606617/nerivofeg-sujiwewufodonor-teluvix.pdfIn PDF document text
    • http://gamaka.melitaberg.com/uploads/1/3/0/9/130969628/6067576.pdfIn PDF document text
    • http://files.cumberlandhabitat.org/uploads/1/3/0/7/130740323/fareraxagesejelax.pdfIn PDF document text
    • http://jomanolu.fabcreteindustries.com/uploads/1/3/1/3/131384169/f51aca3a1ef.pdfIn PDF document text
    • http://files.campbellresearchandconsulting.com/uploads/1/3/2/7/132740694/lozinafexikon-duwafaledomeza-fodubigugawavo.pdfIn PDF document text
    • http://mujobega.matterbotattica.com/uploads/1/3/1/3/131379724/vebikuro_wonirusos_punefisi_guguf.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/06726549-028d-4dae-acb9-f29bd4eab88e/13461615560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ddc5ae-68fb-4e3b-b82d-695805507b97/2442061339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5295/7335/files/eye_and_brain_richard_gregory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4452/7525/files/salesforce_powerpoint_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000098f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F8 5592 bytes
SHA-256: 090d6a622b23a4b70ea3e227d547d4b63b2703e6c8c375a36beed658289bbb3e
font_01_sfnt_off0000ac15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC15 12812 bytes
SHA-256: 7a4f5ebf3dc32f49346694632ab0c3606d4804aa3d5bd15d1577a0d6fd234ffe
font_02_sfnt_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 16748 bytes
SHA-256: 2deb4fac6b9e1068e569ae44688712bf10fe2fcef14ef6e7c97714091c7548fe

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