Malicious PDF — malware analysis report

Static analysis result for SHA-256 449ec3dc1027dbfd…

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 03:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: be8d39fe9ce9bc2c5a24162817392fc1 SHA-1: 897aba3a38261f8d5ff6216d94d50dbc0c5cc48f SHA-256: 449ec3dc1027dbfdbc6a67f6e26901299fb252c7248cc3bfbd988e4b02dcb6b0
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link that leads to the URL https://cctraff.ru/strik?keyword=z-ro+these+days+mp3. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a music file, suggesting a social engineering tactic. The presence of numerous other PDF links, many pointing to S3 buckets, indicates a potential link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=z-ro+these+days+mp3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5f962766682e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8891c6e3b7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/janodojivi/abiraterone_acetate_synthesis.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/invasive_pulmonary_aspergillosis.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/ajay_yadav_anesthesia_download.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/adobe_reader_password_protect_document.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3cbf87-80c3-4e40-a907-91cf199591fc/22690672614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4981ef44-f29d-4326-8898-2527d0ee4b98/dalekibagolukepomiwexew.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/primer_of_public_relations_research_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/bridging_the_gap_college_reading_13th_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/aline_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/spanish_reading_comprehension_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1942/files/how_to_make_microwave_ramen_noodles_better.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0acb43f-e494-4429-ba9e-d0139df0b75b/legujeferokewokofexute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2976fc73-bb91-4eb2-8053-e667f233457f/dawax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d29671-22f7-4e90-a4ef-cc7d7e84f9de/50330667421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b910dac-0aa1-480c-a4a1-94d558ff0f2e/budajigajekem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bacbd0-2fab-41df-97af-13cfcac332e0/lawijofixegojoxezita.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_off00006b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 5424 bytes
SHA-256: e75e82ab35be5ce91df6220f4006ee711313330e7949deac4cfca5a3ddf2fac7
font_01_sfnt_off00007dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBA 10984 bytes
SHA-256: d3da4532bc1ae1b7f9d4cc7fc693d9b2c1d9170656d9938a7376b1b2fdf3ada7

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