Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b4c6d7101339ac…

MALICIOUS

PDF

80.8 KB Created: 2020-12-07 23:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 70d7d1b17833f2c75ca6d7c3696f490f SHA-1: ba0615c89f4fcd6c8574b926198958b35a6c462f SHA-256: b1b4c6d7101339ac525c79c435bfc7a15c5562c18fd9f3f08b0a5975a796f5dc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for malicious redirector infrastructure. The primary malicious URL identified is 'https://gettraff.ru/123?utm_term=hyperconjugation+in+organic+chemistry+khan+academy'. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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?utm_term=hyperconjugation+in+organic+chemistry+khan+academy In PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/faxojofomikixuvefiwi.pdfIn PDF document text
    • https://povewagefafede.weebly.com/uploads/1/3/4/8/134888055/6289226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6489b16f6d44b07e34629/t/5fcab281a89a5a57c5ff82e6/1607119489700/20380392311.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc34a14bda9c57a97cd8cb5/t/5fc6ffe83d56556d14326cca/1606877160742/bametuz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf58f1af5bf52c326accb/1606219151921/98986532422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6314a24d-b17c-4b82-8346-90f7dda2a850/how_to_see_better_through_a_morphsuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8ae89f-4646-4553-a37f-c1c1aa1d4ff9/how_to_make_cobble_generator_in_nether.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed69a0c6-ea43-44b7-a6e6-832b848675b9/16972558081.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd6e2c6d96458361c2338/t/5fc1625f64571256546feced/1606509151368/un_derrame_cerebral_in_english.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7ad01849d1727bc13d9ef/t/5fcdb2480ab5d62feb10b36f/1607316040481/samsung_smart_switch_mobile_para_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796306d8-c1b7-4c43-ac8a-25d043c40d2f/76111425969.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58fccbf71053ccb2f4d5f/t/5fc68ce9a97599144edd5916/1606847721561/football_strike_world_free_flick_league_games_today.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4d48fa04221c7116b6e9/1606372682999/zojulumuzejusepopetivun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d3d24b-6778-4a10-a7e7-43389a8dd49c/engineering_design_by_george_e_dieter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c273a13a450babf34cb7/t/5fc254baa97599144e433bcb/1606571196843/pa_state_ethics_commission_opinions.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_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 5660 bytes
SHA-256: 4f49e8df4a07b97ddb7f074bd2b1ffd8093bcbb3a26ffad0b5b13dfd75e9729e
font_01_sfnt_off00010ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE1 12188 bytes
SHA-256: ecbb39ac4abd20dec5a2980ed12f2e1c5ad5d3f90bb721e2bdb05e9455731d10

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