Malicious PDF — malware analysis report

Static analysis result for SHA-256 174e1c6a28e19215…

MALICIOUS

PDF

45.8 KB Created: 2020-10-05 10:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ea85ff1706465ee4b666cc91aa4f6b4 SHA-1: a60df371e006cf8f7cf6a0807ac7f43c27dd27d1 SHA-256: 174e1c6a28e1921552c2ba32bd0b840760d79e27460be126427739021c799e93
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, specifically `https://cctraff.ru/strik?keyword=descargar+fl+studio+11+full+con+crac`. This URL is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains references to this URL and other suspicious links, suggesting a lure for downloading software. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=descargar+fl+studio+11+full+con+crac In PDF document text
    • http://files.anjelicacolliard.com/uploads/1/3/0/8/130874067/0e265a4.pdfIn PDF document text
    • http://files.honey-land.eu/uploads/1/3/0/7/130775462/9037731.pdfIn PDF document text
    • http://files.cobberdoglabradoodle.com/uploads/1/3/1/4/131412032/8064575.pdfIn PDF document text
    • http://files.afparc.org/uploads/1/3/1/3/131382786/molof_mufeluwege_nefiwoge.pdfIn PDF document text
    • http://natuto.the-blessedseed.com/uploads/1/3/1/4/131413418/zasotizizekalagiwe.pdfIn PDF document text
    • http://files.ceciliadesigns.com/uploads/1/3/0/8/130874679/f6038c97526.pdfIn PDF document text
    • http://kuxurom.cumberlanderfamily.org/uploads/1/3/0/7/130776487/12b27.pdfIn PDF document text
    • http://files.bodemoonlightgardens.com/uploads/1/3/2/7/132740228/3091157.pdfIn PDF document text
    • http://jumew.apneaodyssey.com/uploads/1/3/1/4/131453915/5ceb0.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/mabaxipedajakorojogo.pdfIn PDF document text
    • https://site-1038309.mozfiles.com/files/1038309/zemixigaroleje.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/655e2aa8-9df9-4c61-a7b9-e1097736d96b/xevuvutalafaguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e899259-2640-447f-b211-a01674de4874/kazuwigalomuvukoxajositi.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_off00007503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7503 5240 bytes
SHA-256: 4692a500cf9c2af0e3763bdaa126ba4de3d5b0ccf623f1bcf6dba3139422fd6e
font_01_sfnt_off000086f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F0 10572 bytes
SHA-256: c25e9440c339cd87aad5f26a8798929aaebc8bce17c9c6d38810a30310f08c63

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