Malicious PDF — malware analysis report

Static analysis result for SHA-256 963e3b1227bac1bf…

MALICIOUS

PDF

43.4 KB Created: 2020-10-26 17:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb1ca0d83d751f5a9ba8c4395297c380 SHA-1: 24544a567903a69e7b75ed7e2a203cd8ec1dd504 SHA-256: 963e3b1227bac1bf638cd030f8585b35cfd317ba7890edd55d4d4e621d0a032c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious link identified is https://gettraff.ru/123?keyword=mastering+regular+expressions+jeffrey+friedl+pdf, which is known to lead to malicious content. The ML classifier also strongly indicated maliciousness, supporting the assessment of a malicious redirector.

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://gettraff.ru/123?keyword=mastering+regular+expressions+jeffrey+friedl+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f8915eb16f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_5f920a41b6515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f891c171e6ef.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/jawapivofefiten.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/fuvudawori.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/sexafefalumulowonusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9876/1125/files/verb_tenses_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/daraw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9375/6571/files/lejabekewupibafeku.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/hs_code_malaysia_2018_sst.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mitisamo.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/acer_aspire_one_722_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/design_and_analysis_of_algorithms_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/jolly_phonics_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/90779385558.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/anabolisme_fotosintesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ba2bdc-7fd6-4899-8287-21deceab6af0/98003016432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e024170-5dfa-4ba4-ab93-e31d16ab2024/62996434005.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_off00006abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABC 5460 bytes
SHA-256: 10429cc5c09a394be24ca4c753280d43ac8408179e1a4c13d547b4a2abcfceeb
font_01_sfnt_off00007d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D73 10292 bytes
SHA-256: 5fa42e8899c5c6a65a6c830e4e12f0b138941539b0239476275068c374acb389

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