Malicious PDF — malware analysis report

Static analysis result for SHA-256 600c72ed043a71cc…

MALICIOUS

PDF

46.0 KB Created: 2020-11-09 02:31:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: eb9d1df0ba9300ce7a1df17fa9aa38aa SHA-1: 1c9fb372692c90632189d9cc53c6befec56a0363 SHA-256: 600c72ed043a71cc9decc545529ec0034fd14b3f16a01ec40c4df7b7f84d6d03
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified as a link farm. The ML classifier strongly flagged this PDF as malicious. The primary URL and one of the linked PDFs are included as IOCs. The document body contains obfuscated text and URLs, suggesting an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=the+walking+dead+vol+32 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f8ca0fa34487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418746/normal_5fa445e6f0ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5f97e5406034b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f91b9a20b6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5fa1a56b4f8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5fa881c99e22d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://meleduzudu.files.wordpress.com/2020/11/arcane_legends_hacks_no_survey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea891ba-05c6-4493-89d4-f29905d7aabf/dveloppement_de_la_table_priodique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d932d745-a03a-44d6-b0fa-7f3d8ac4b3f3/75756295148.pdfIn PDF document text
    • https://miloxujakube.files.wordpress.com/2020/11/jepezoditosatupu.pdfIn PDF document text
    • https://mutabivini.files.wordpress.com/2020/11/journal_of_development_and_agricultural_economics_impact_factor.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6891c9-cba4-42d3-8f1a-3b32e7e44f78/weekly_idol_ep_320_eng_sub.pdfIn PDF document text
    • https://pukatof.files.wordpress.com/2020/11/59405853652.pdfIn PDF document text
    • https://defimoni.files.wordpress.com/2020/11/jigexorujebovub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc52b3de-9d75-49d4-a0a9-b2e6b42ba1cc/gnmz_trkesiyle_evliya_elebi_seyahatnamesi.pdfIn PDF document text
    • https://vegekobifoxa.files.wordpress.com/2020/11/kodagatafuwupuxixuvuliwot.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EF 5276 bytes
SHA-256: 09fb7b1626e10d91c148a047c7cd063cc617b4380a395a9613daf21ffda412f1
font_01_sfnt_off00007afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFD 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000865f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865F 10768 bytes
SHA-256: db3d125504ca0383c122e5b2e2cb0ac87f01177ad5b3ae6152a00ce1a7e5a9e2

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