Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff435e0532743ec…

MALICIOUS

PDF

40.7 KB Created: 2020-11-09 02:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 65654313125c2127b660315ac0e62bc3 SHA-1: 148b937e130a944b29d17e914b55c7c447e4ffb7 SHA-256: 5ff435e0532743ecf8d1cf3efe72f45487b607afddaf9089d578e97d816c6f77
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=nintendo+wii+lens+cleaning+kit+walmart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f9b6161aa333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f887d5d8b282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f979657353df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5f8969492e0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f89f4b1d0bbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://zidudadeg565145698.files.wordpress.com/2020/11/prentice_mulford_thoughts_are_things.pdfIn PDF document text
    • https://temobozuz.files.wordpress.com/2020/11/45462442054.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/kudijiporibozo.pdfIn PDF document text
    • https://jevuvibojaz.files.wordpress.com/2020/11/8522847519.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/jetimekimopesavurew.pdfIn PDF document text
    • https://xututino.files.wordpress.com/2020/11/quartus_prime_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/goldman_s_cecil_medicine.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/anormalidades_morfologicas_de_los_leucocitos.pdfIn PDF document text
    • https://mereluk.files.wordpress.com/2020/11/tv_guide_dstv_mobile.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_off00005db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 5384 bytes
SHA-256: b231798cb0fc7176da99f23cee0230f0bf1b6764cc65d00bd62e0d4760921b3c
font_01_sfnt_off00007003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7003 11224 bytes
SHA-256: ddce545d332d54f765c90e1a3dc9bfd38a8d47da4f232dfd8233ef744f637885

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