Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1d824bac02eb2a…

MALICIOUS

PDF

40.6 KB Created: 2020-11-07 06:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 82daa93d729963d5fa147aa0d9404c7b SHA-1: c5622481c6c5aa025ceefd186a52284906728226 SHA-256: fd1d824bac02eb2a5ca531c65bd8c4cd61babe05f54ac815848e96bec08569b5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded external links, with one suspicious URL pointing to 'traffset.ru'. This heuristic, combined with the ML classifier's high confidence, suggests the document is part of a link farm or SEO manipulation scheme, potentially distributing malicious content. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of malicious intent.

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://traffset.ru/123?keyword=words+starting+with+sori PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f9cf5f01-4c39-4784-8f03-fc97b115e15e/craft_contingent_spell_3.5.pdfIn PDF document text
    • https://dowuwiridewe.files.wordpress.com/2020/11/muzamexivigasokojinanuzur.pdfIn PDF document text
    • https://tisobex.files.wordpress.com/2020/11/25166949909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a62677-176f-497c-97b3-7dfdda371a59/pokemon_sun_and_moon_episode_70_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77f800e-f072-4024-978b-b9453a1c3897/osrs_range_pure_guide_f2p.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/greatest_common_factor_worksheets_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/74648466306.pdfIn PDF document text
    • https://pixetimel.files.wordpress.com/2020/11/10564936711.pdfIn PDF document text
    • https://saranadodaxu.files.wordpress.com/2020/11/after_effects_ffx_presets_free.pdfIn PDF document text
    • https://sexonilapaxo.files.wordpress.com/2020/11/52620415531.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5373 4832 bytes
SHA-256: 9edbc30e3258ba88f1aeef013abf42d7e7d09f44cead219b9c8aaa790ea44fe0
font_01_sfnt_off000063e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 10536 bytes
SHA-256: f55b5b6fd71fb48740f313eb2e31c09abc227fdb8b2cc9326734518f6ff181ac
font_02_sfnt_off000087f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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