Malicious PDF — malware analysis report

Static analysis result for SHA-256 485b9ba0bd567ec5…

MALICIOUS

PDF

47.0 KB Created: 2020-10-09 05:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 83d08ef1ac168a602b2ef3988a5ba9c5 SHA-1: 8d112b99b01be4deb9abe2f984e9bed5a3efbfe8 SHA-256: 485b9ba0bd567ec570603a9e2a0f1cf9c8a980e64fa8f2ed3dcc1cfca65f73fe
164 Risk Score

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ttraff.club/pify?keyword=viera+cast+apps+update In PDF document text
    • http://files.readersbeware.com/uploads/1/3/1/3/131380745/a9207ae603.pdfIn PDF document text
    • http://koxil.simonlread.com/uploads/1/3/1/6/131606289/zapoxaxuwini.pdfIn PDF document text
    • http://files.sandranichtayurvedayogatherapy.com/uploads/1/3/1/4/131406427/2426847.pdfIn PDF document text
    • http://joledozi.chinalux-bsc.com/uploads/1/3/2/6/132680901/3164130.pdfIn PDF document text
    • https://site-1037833.mozfiles.com/files/1037833/xogenoligizorarej.pdfIn PDF document text
    • https://site-1040223.mozfiles.com/files/1040223/79395346122.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/tevujosumojup.pdfIn PDF document text
    • https://site-1042502.mozfiles.com/files/1042502/zuxesit.pdfIn PDF document text
    • https://site-1039762.mozfiles.com/files/1039762/74842110982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 5000 bytes
SHA-256: 67d47c2cab0d34d9c203c371aa48397633d580059a174b6e5285799a959192e8
font_01_sfnt_off00008077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8077 15244 bytes
SHA-256: 5f01be48923383a4c6152bcb77b9257750f4a348a141db7cdae250384765db4e