Malicious PDF — malware analysis report

Static analysis result for SHA-256 6112ab66725d0089…

MALICIOUS

PDF

75.9 KB Created: 2021-01-12 14:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 83399da2baad85dd178182ed3f206a7a SHA-1: 9865d7e0da7c229c985333ab83e8e3fe5aebc7e8 SHA-256: 6112ab66725d00890420f59d6d811d105740f0fe17585c7f09c41a60478f849e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, cctraff.ru, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains text related to 'Assassination Classroom' and the authoring application, suggesting a lure to entice clicks on the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent.

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/aws?utm_term=assassination+classroom+live+action+movie+free In PDF document text
    • https://site-1171796.mozfiles.com/files/1171796/the_farmhouse_needham.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fa1c7d8646a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5fb30984c50a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_5fad9c05ac4e2.pdfIn PDF document text
    • https://site-1177773.mozfiles.com/files/1177773/the_solar_system_pretest_quizlet.pdfIn PDF document text
    • https://site-1180361.mozfiles.com/files/1180361/povowuxapowelatapun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f8711d16e9ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f89cb3d12f7c.pdfIn PDF document text
    • https://site-1172440.mozfiles.com/files/1172440/govebomes.pdfIn PDF document text
    • https://site-1168109.mozfiles.com/files/1168109/bionix_wallpaper_setup__exe.pdfIn PDF document text
    • https://site-1177829.mozfiles.com/files/1177829/space_trek_suit_adventure_capitalist.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/lunutebe.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/bixomevemopuxonabuze.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/bubble_shooter_genius_mod_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/wordpress_template_company_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/society_bye_laws_2019.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_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 5076 bytes
SHA-256: 286e17a7fb4db67867fdc6a178b603cc8d52bef98ec092772b5c31f4ea9d426c
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 11324 bytes
SHA-256: 4dcdcdbb8d17043aaafb51bd466470e1ea251bff2abaca2221604b78fef49eb0

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