Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f28aecf935ab7e…

MALICIOUS

PDF

42.7 KB Created: 2020-10-07 21:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9aef19a9980c8d71b4076600d1657492 SHA-1: 3e01341d706d4d355b597a49c3fc13bd4ded5326 SHA-256: 60f28aecf935ab7e3758ead14437c4660346aa7aeb83260761f816dab251249d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The primary redirector URL is `https://ggtraff.ru/strik?keyword=normalizer+and+centralizer+in+group+theory+pdf`. This pattern suggests an attempt to distribute malware or conduct phishing through a network of compromised or controlled websites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=normalizer+and+centralizer+in+group+theory+pdf In PDF document text
    • http://bipara.barboursvillemoose.org/uploads/1/3/0/8/130874284/bidebazabemef.pdfIn PDF document text
    • http://files.wildthingyogaboutique.com/uploads/1/3/1/4/131409274/mekarononuselegije.pdfIn PDF document text
    • http://files.addingtonforge.com/uploads/1/3/1/8/131871627/pafezaxubepur-gabaxa.pdfIn PDF document text
    • http://files.kings-hantsndp.ca/uploads/1/3/0/9/130969845/ca5698a3e.pdfIn PDF document text
    • http://files.mouseandmeco.com.au/uploads/1/3/1/3/131384279/3078175.pdfIn PDF document text
    • http://files.glcconcordnc.org/uploads/1/3/1/3/131381819/656607.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/0ad66e54-0776-4b02-9260-1b85eda5ace6/mukusupexisototepubefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3166316e-bb4d-4fd9-b3ce-de76639783de/40194017340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e20329-2bae-4741-b51e-831fc57486df/65820879958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/algiers_point_rentals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9280/1704/files/48738643908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/49506574661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3189/8523/files/zombie_defense_games_unblocked.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5389 5512 bytes
SHA-256: 7b956d96a75aac97a52b2570aa4a62be43289e8cb073c2d2372e6de2c5809fc7
font_01_sfnt_off00006631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 9824 bytes
SHA-256: 9f94a694d62c8953608386c7d6f6b7083ba24c20ac277ae73f2e1e115c029941
font_02_sfnt_off000087fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87FB 16272 bytes
SHA-256: fe052953c1a9d7cd2307a58c61bcc5ee8c5fd1562795072b4e0526b73df99527

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