Malicious PDF — malware analysis report

Static analysis result for SHA-256 2148df7fe6a9cf61…

MALICIOUS

PDF

38.0 KB Created: 2020-10-04 18:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bb8d179c76c3bad533bb220d189f900c SHA-1: 3215eb3e5b08fc65555d4082b733f5c9c3060ad6 SHA-256: 2148df7fe6a9cf61bdd1a741261415745ccc347aa73b0b2ee5e51cb082e9f3b8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 lead users to malicious sites. One URL, 'https://cctraff.ru/strik?keyword=the+nemechek+protocol+for+autism+and', is explicitly flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=the+nemechek+protocol+for+autism+and In PDF document text
    • https://site-1037238.mozfiles.com/files/1037238/fawumapukabefa.pdfIn PDF document text
    • https://site-1042620.mozfiles.com/files/1042620/kupitokozigumoperobi.pdfIn PDF document text
    • https://site-1038492.mozfiles.com/files/1038492/87454841243.pdfIn PDF document text
    • http://files.yourlakeforestpark.com/uploads/1/3/0/9/130969966/xaluboketa_bogeg_fagimajuzib.pdfIn PDF document text
    • http://files.themagiciansindicator.com/uploads/1/3/2/6/132681384/b8eaf34186cf7.pdfIn PDF document text
    • http://files.petejonesphotography.com/uploads/1/3/1/1/131163969/b7efe6.pdfIn PDF document text
    • http://files.firewiseconsultants.com/uploads/1/3/1/3/131380467/8300795.pdfIn PDF document text
    • http://files.mobilebeatzofcolorado.com/uploads/1/3/0/7/130738876/tatolepelojifedoxite.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/9d3d0872-2fd2-4738-986f-b788834d71f4/xenopolojadofiwodenozete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c530994-149c-410c-abe1-3795a5a02898/sozekipuzalosuneti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b0e9e5-11c2-43bf-9b0e-7cfb921c95ea/43949580665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375f9ebb-f3bb-489f-a047-97210f8c5a13/5741295117.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_off0000559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559F 5408 bytes
SHA-256: b61d60c7757b51ae633054425461885b8b1002ebc8a54e1df4d3ec25cd6e9437
font_01_sfnt_off000067d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D9 10332 bytes
SHA-256: 2557b7ffe5ad132d26f8a07da03adfedc6d7c8fbebee9cc3ddab38e039d7ba5c

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