Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fb4dfb178324da…

MALICIOUS

PDF

117.3 KB Created: 2020-10-26 22:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e2c19096cb8ec1979e2ddadf579bb27a SHA-1: 16176d68b996dfcc32266199e9493831112ece83 SHA-256: d5fb4dfb178324da37b81059b78b8e73887013dd86135cf1cf5e2b1711a60666
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 0.9999

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=east+asia+map+three+gorges+dam In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f965d4757ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f910073d6af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f941d492a3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f8a8a94d3dc6.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/edbd2edb1a75.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/rideresekisaza-benuxo-sumanororuvifu-ritemerefisifi.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/63efebcb-293f-46f9-b33a-8bb5659e7e09/47327707899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299d27b6-051c-487d-b9e4-9d1e2a379178/financial_accounting_tools_for_busin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0427eb53-88bc-4607-b50b-8041f13771df/lenovo_g50_30.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/99577396198.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/unlimited_power_tony_robbins.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/18272858752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b04b89f-020c-4503-b688-cd2bae570a36/20911472027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f08ede-f7ee-4bb2-8b09-56b596a37ba5/86181885046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0cf1d6-814d-4a3e-a796-a6cefe4ae2ec/75279213333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b9bc40-d153-4137-96b3-5215302cc3a5/wonaxutokij.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/esri_story_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/rrb_je_previous_year_question_paper_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/wurewoli.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_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 26068 bytes
SHA-256: c368e73ae7670596803dc064eb50624bb5e11b42b6765b8794bc48f5c3b866b5
font_01_sfnt_off00017000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17000 5300 bytes
SHA-256: 0354c42d111fbfab1fa35b5e1934e1a5523b6156a4542cbb5980e93e169d483c
font_02_sfnt_off000181dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181DC 15712 bytes
SHA-256: 0f027e3d987286440a1dda0ab7a9e92018aecd68df4b6ee0c200ec02c7571ecb
font_03_sfnt_off0001b04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B04C 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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