Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f40c43669829cc8…

MALICIOUS

PDF

51.7 KB Created: 2020-10-29 04:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5d9df308a558c937062f042b64ea4a6c SHA-1: 14f9f6bbaf6427b8cdecf07346226c3a668e9c20 SHA-256: 1f40c43669829cc8923bdd0128c080aaf3d482b0b5462ea9cc6af40cc8e5cb60
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/strik?keyword=winkler+middle+school+powerschool In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5f933cbca9bd3.pdfIn PDF document text
    • https://vorenamu.weebly.com/uploads/1/3/4/2/134265490/xusokibowok-vodinoxu-gixip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f8a418dc3a45.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/mebikozilozu_wegor_bujafalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f962e51a9112.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/vemegarobema-xinexolo-gavegomavaxovow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7f320bee-f2f5-44e9-8fea-3fbe0cd9ee35/2019_tamil_dubbed_movies_madras_rockers.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/basketry_merit_badge_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/39091663759.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/forks_over_knives_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/32722077337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7967d5b0-675b-439d-88be-101bba933721/26688802777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdaa08b2-fa62-48d5-830f-b597a103080a/wejomutux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1026/9085/files/92769509684.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/knight_of_swords_reversed_as_feelings.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/biometrika_tables_for_statisticians.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3775/2996/files/literacy_and_numeracy_learning_progressions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d61740-6a0a-4664-963b-e2018a51eebe/winiju.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/al_ghazali_books_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/business_english_finance_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19365a0b-2396-4bd0-b437-56da41a31efd/49796250643.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6794 4980 bytes
SHA-256: 30c8484e6886844a7439dc15762b9b7b7b6d58ce037d3d1b2fc39efd347c4bd5
font_01_sfnt_off00007852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7852 10792 bytes
SHA-256: b8d9ebb4071e8fc202d682c1d85baadee7664eb06f51423a4404147109976e1d
font_02_sfnt_off00009cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBC 16076 bytes
SHA-256: d5797f08becf5301e59b03c9e561a561b786babfe4b2d135aa267657689c68fb
font_03_sfnt_off0000b169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB169 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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