Malicious PDF — malware analysis report

Static analysis result for SHA-256 50263be9bc50cc50…

MALICIOUS

PDF

45.4 KB Created: 2020-11-07 12:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ac8d67a9233ac4b4e270c12ff5516b6b SHA-1: 159995a6783dcc90d91934cc66a1c1782b564e37 SHA-256: 50263be9bc50cc501ec36b88e329c2844d6c6af7126a8f06bb66efbedffee9af
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spamming operation. The primary URL, https://trafffi.ru/123?keyword=aztec+homes+for+sale, suggests a lure to a malicious website disguised as search results. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristics strongly suggest malicious intent, likely to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=aztec+homes+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fa56eb162a15.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/sewiwiwali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5f9ae17b08aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f9ca98c8bf66.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/wudepinuruduxajaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f9c348797b11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f9cf8de0176d.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/0027fde3-b7f7-4a16-b24c-73792667619e/angulo_de_elevacion_y_depresion_ejer.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/lajil.pdfIn PDF document text
    • https://tapevekijadu.files.wordpress.com/2020/11/sufegidozofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f822a3e-c29e-406e-a91b-498329b85ebf/42366030420.pdfIn PDF document text
    • https://xixunetov.files.wordpress.com/2020/11/redragon_s107_gaming_keyboard_manual.pdfIn PDF document text
    • https://gamupizepe.files.wordpress.com/2020/11/16564915935.pdfIn PDF document text
    • https://jadanadu.files.wordpress.com/2020/11/hard_sometimes_ruel_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/mukogimapaduzev.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/parts_of_a_microscope_worksheet_answer_key.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_off00007557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 5160 bytes
SHA-256: 4623d28728a46e8a895d79a25bb7e9e997eaceaf5bf1b6dd4487d6c4320dbc35
font_01_sfnt_off000086c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C3 9960 bytes
SHA-256: 8a6970d7884b1330a0e440e0c37318ab797a81093c1a098b0bb653e3fa47388d

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