Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe553df95e91ef3…

MALICIOUS

PDF

49.7 KB Created: 2020-10-09 00:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7c4ae39c1d76f8a932f1fb053ec5ee5 SHA-1: e0f961511f48fce1811ba88d8b40951c6316e5d3 SHA-256: 4fe553df95e91ef317b0a9f19ccf6c28736df39fdb18c31da15f870d44d89be9
132 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure reinforces the phishing attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for further payload delivery or credential harvesting.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=hd+avi+movies+720p In PDF document text
    • https://site-1037005.mozfiles.com/files/1037005/23212321068.pdfIn PDF document text
    • https://site-1036633.mozfiles.com/files/1036633/bobigonozifixobu.pdfIn PDF document text
    • https://site-1038627.mozfiles.com/files/1038627/55735938264.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/sazoxujefarix.pdfIn PDF document text
    • https://site-1042767.mozfiles.com/files/1042767/fupuwunubagetepidofumis.pdfIn PDF document text
    • https://site-1037920.mozfiles.com/files/1037920/ripiferefavirimakavu.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/bisudurakumaxetubofekigu.pdfIn PDF document text
    • https://site-1039226.mozfiles.com/files/1039226/nivetaroxemono.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/69734730588.pdfIn PDF document text
    • https://site-1041289.mozfiles.com/files/1041289/59979461900.pdfIn PDF document text
    • https://site-1038345.mozfiles.com/files/1038345/levusujeg.pdfIn PDF document text
    • http://files.akesbespokewoodwork.com/uploads/1/3/0/9/130969002/9c744761.pdfIn PDF document text
    • http://pavaja.lachozaspa.com/uploads/1/3/1/3/131382486/pomeperakawewez.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_off00007c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8C 5352 bytes
SHA-256: 6af4ee219d3659c20e6e66974d9ab9cf78419e72120bcea52c4896dcfa04efe4
font_01_sfnt_off00008ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC0 13916 bytes
SHA-256: c202c7b17226305226d3d42469b8c268cf91fee4f5efbba9212c0d9ffc27152d

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