Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fb7f602d172d8e…

MALICIOUS

PDF

45.7 KB Created: 2020-11-04 20:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 591e77a4c5ef2e9f3fe484ab9c439904 SHA-1: 2af9519f1fd790c7623bcea71a439b3b47494fc4 SHA-256: 77fb7f602d172d8e5777276370303a68e820066e7f0fe5f0bf885b759d8e5d25
154 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 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://ggtraff.ru/123?keyword=the+five+people+you+meet+in+heaven+book+pdf In PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/4563970.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/nizemizejalisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f95fa31740e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeeee5df-5605-4e10-80fd-24a2ddf45e32/autodwg_to_dwg_converter_serial_number.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/spartanburg_prison_inmate_search.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/sultans_of_swing_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/anti_inflammatory_activity_of_medicinal_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/45774007267.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/ruxomunejotoresop.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/75460917218.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/83774520847.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/calculating_gross_pay_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/tcs_email_writing_questions_with_answers_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6704 3568 bytes
SHA-256: ed4e74c7dc2a29c3d360ab45d728b941b006a289598816620b0540252e5cf4dd
font_01_sfnt_off000073b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 5320 bytes
SHA-256: 5585df81d874f8a09e4d421a42692957610cb392c62dfc92d981c8a77365a21b
font_02_sfnt_off000085b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 10848 bytes
SHA-256: f4f4c7f1dd3a180613a146117bc5c079edfc3ec1358bf7b1307f5f555dcc684f

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