Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbb6eeb29edee6f…

MALICIOUS

PDF

48.6 KB Created: 2020-11-07 20:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c4d47cc500cc9fe660cf5bd6485cabb9 SHA-1: cd3cadb23ff1b39ca29a0919beb39846010719b4 SHA-256: 9bbb6eeb29edee6fcb8c38fc50a866a75797fafac7a8d4f27c7a59cabb5ac997
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on disposable domains or redirector services. One such link, 'https://cctraff.ru/123?keyword=captain+jack+and+the+face+of+boe', is flagged as malicious. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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?keyword=captain+jack+and+the+face+of+boe In PDF document text
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/tiwuwegat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87253044786.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/6488141.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/9181559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f907ed3d2080.pdfIn PDF document text
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/e4177b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_5fa18844ad549.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/guburonemotam.pdfIn PDF document text
    • https://sanizazifu.weebly.com/uploads/1/3/4/5/134599836/penaza_wizezig_kevixafe_jalulusipino.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/7100259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f94f8f8c6d75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gukoxawe.files.wordpress.com/2020/11/20884693481.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/borderlands_2_unkempt_harold_farm.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684B 5124 bytes
SHA-256: bc71f3582c391449a8b7d48dbc9a6c0d46874e1fd6ea588cfd93c09a86c67601
font_01_sfnt_off000079bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79BB 10396 bytes
SHA-256: 2b2ceccce24d2875bef9574e299819da226de83e21b978246878bed0039c56cd
font_02_sfnt_off00009d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1C 17036 bytes
SHA-256: 710182b52fbea9225bd9b2ebcaf35a1de49d30b104b73cee1203b5ccfeaa1631

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