Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f63e9d2447b52ac…

MALICIOUS

PDF

52.4 KB Created: 2020-10-02 11:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a8323e6ec9f2f400daae99703c653a18 SHA-1: 7da833ae96aa15ac97432c3a0c5f29520c660788 SHA-256: 6f63e9d2447b52acef0092b1df0395fdaf3b6c98894c93e1d488cd64030f1ca6
134 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The document body, despite being truncated, suggests an educational lure ('Estequiometria 4 eso') to encourage clicks. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a phishing attempt or a drive-by download facilitated by the redirector.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=estequiometria+4+eso In PDF document text
    • http://gexivag.davidlrenfro.com/uploads/1/3/0/7/130738526/4504698.pdfIn PDF document text
    • http://files.ibmypphe.com/uploads/1/3/1/3/131379789/sovatipeleva.pdfIn PDF document text
    • http://niwomofa.mtzpbc.org/uploads/1/3/2/7/132740214/1842270.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006e46.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006e46.bin)
    • https://cdn.shopify.com/s/files/1/0440/5175/9269/files/chesapeake_and_new_england_colonies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca0fe5d-1c0f-498d-9c00-7fcf8860cd26/92337959122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be631512-15fb-4c73-809c-4df3397aa35f/67874424354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8038af40-d729-4813-a8c0-f5c677c5b2d1/zojekadizubijibome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1932eb74-ecf9-4e88-9190-ea9088aebf96/37403972548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbc8d59-554a-4866-87d8-2f2c3500bd22/95241457654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da79e6a4-0d90-4f2a-b9ce-bae9df6bedb7/vixasaninuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574163c5-5749-4d86-81b7-cd631cbe533a/xobepatig.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 extracted file (font_00_sfnt_off00006e46.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off0000ae28.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off0000ae28.bin)

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E46 4972 bytes
SHA-256: 34ef89cfdf7acc41c46531ee8899090fa14cb73f39230db41d41276757c5646f
font_01_sfnt_off00007f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F16 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off000087a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A3 11768 bytes
SHA-256: 1d458c402b6e69d13fef211c6a9157e131a40c75907268bde93be61b78d59d97
font_03_sfnt_off0000ae28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE28 16484 bytes
SHA-256: 7f5809fed39c7dbc93ff32ee544c324a6eeda900c31f3500474f38f3cb7625e9

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