Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72927dee6f978e7…

MALICIOUS

PDF

41.6 KB Created: 2020-10-02 13:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fae888d9204a33ea712797004a6c6e3b SHA-1: a3109f17dae4a9b03761ef74891431ef824b5ffa SHA-256: f72927dee6f978e71397b34d7f9ce07ae80db27245c704af4b465d94efa7abca
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://cctraff.ru/strik?keyword=ensayo+sobre+la+ceguera+pdf+por+capitulos In 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/d6258875-def7-4683-a363-f5593de3ba19/55898863833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddaee9e9-fb86-4346-8d68-a94c01161d50/12864013241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297d30f4-3041-4aca-92f4-17cd0505a3c3/22183474126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4aea1e-8fb8-431e-b058-a873df8e40b1/borozupegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0febb72a-a970-4752-9099-3aaf6faaae19/44749501599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad22202-6829-4db7-9e3e-d39c5b6a98ef/xafapifasukovorebebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad86398-1afc-4319-a1ed-111c9b73f651/faxatemutofozowiwofexuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82be2512-7cfc-4282-abe6-975c2fd48ad1/16606431941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7a16f6-de11-4e72-a3d0-6060f857d99f/65156856708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af14705-51a1-4e2a-b9b5-e3a48803f274/bewelenozamajarowopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9465/3595/files/tipos_de_fichas_de_trabajo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/pokemon_reborn_7th_street_entrance.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_off0000620f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620F 5520 bytes
SHA-256: 6901fd400b17b685eddd2b58da62ad64c9f823a9af3d682c4422f9d2dd077e6a
font_01_sfnt_off000074ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EA 10792 bytes
SHA-256: 9a499b49007546b22d4f84c68093591451b2375ed90c4748dacd0bdab0a5b994

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