Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c75fcb7fe965501…

MALICIOUS

PDF

40.2 KB Created: 2020-10-27 09:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d3a357b1002e8e2c4971aa991d7dfcc3 SHA-1: 12210f8a359c19087727617dd92f1ca4c5aae1c4 SHA-256: 3c75fcb7fe965501e3e481c3f190799dffd4380224b99886f22c34bf1b868ddb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/123?keyword=shelmerdine+latin+answer+key+pdf, suggesting this document is part of a phishing or malware distribution campaign. The ML classifier also strongly flagged this PDF as malicious.

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 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.
  • 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://ttraff.cc/123?keyword=shelmerdine+latin+answer+key+pdf In PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/zofolavumot.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/wizesovu.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/tumurozenomiwo-xakenidezaz-pukowosax.pdfIn PDF document text
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/taxelenul-medofi-gijifewitafas-vonuj.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/rageweka-butusa-ragaj-xikuwijogodotut.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/e75faad.pdfIn PDF document text
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/2340040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f8e083632c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f890dd972460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8ec478eef89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f9428cc6d801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f86f92d58b52.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/jamokaroxoj/tanudap.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/python_interview_questions_for_data_science.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/makerere_university_private_admission_list_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/94619949210.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/difference_between_manual_and_automatic_transmission_system.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/agenda_2018_semainier.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/1583506907.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/xejugerik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dec892c-50fe-4c31-97c9-367b00587b18/don_t_know_much_about_history_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff4dc70-4258-4581-b581-c1a7c500a5f4/comment_ouvrir_un_fichier_sb2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e0540b-8315-4818-a921-2a0fadb1845b/54223117812.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_off00005b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B62 5644 bytes
SHA-256: 643d458ceb92983724b6ac30ca484b458d1304d22c5ad1fcfee098b283acb130
font_01_sfnt_off00006e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E85 10780 bytes
SHA-256: 709cdceab0436f7e597b9e0090cf4a6949b4f9cc87d8ccf2b3596a4a354624e8

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