Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8af139f9ff60b9…

MALICIOUS

PDF

106.9 KB Created: 2021-01-20 10:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5abd212252f55e546c12975b1b60ed4f SHA-1: d60116716716d7d992efeba22d2adbb9f426fabb SHA-256: 9a8af139f9ff60b9aa851651fa3366cd8bafc721a1b29571dc8ac7e92975a24d
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL `https://cctraff.ru/123?utm_term=cursors.io+hack+2019` is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'cursors.io hack 2019' and the wkhtmltopdf application, suggesting a lure related to hacking or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=cursors.io+hack+2019 In PDF document text
    • https://site-1246361.mozfiles.com/files/1246361/creedmoor_texas_weather_report.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/cgioihN/idle_breakout_hack.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/28729251228.pdfIn PDF document text
    • https://site-1192107.mozfiles.com/files/1192107/37090201844.pdfIn PDF document text
    • https://site-1176433.mozfiles.com/files/1176433/game_web_templates_free.pdfIn PDF document text
    • https://site-1180969.mozfiles.com/files/1180969/57157605563.pdfIn PDF document text
    • http://raxuzogigegekaj.66ghz.com/73643536548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefigubisi.epizy.com/74910335358.pdfIn PDF document text
    • http://nadiripu.epizy.com/tupinemo.pdfIn PDF document text
    • http://godavuvexo.epizy.com/templates_in_mailchimp.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/rewivisulunanike.pdfIn PDF document text
    • http://lenegimuni.epizy.com/nesarilifafigofexivixi.pdfIn PDF document text
    • http://fedukiz.epizy.com/broadsheet_melbourne_best_bars.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/fema_is_42_answers_quizlet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16165 5340 bytes
SHA-256: 394d5a09be2b96712617eb5e78a54d35bd31cd926c5f8467864b2c3f36f65528
font_01_sfnt_off00017386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17386 13428 bytes
SHA-256: d658916da429fdef592d79052b2edf20d1f4bfc3f6f6aa14408af1854847a8b6

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