Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d33aba2e5f6ba7…

MALICIOUS

PDF

43.6 KB Created: 2020-10-27 12:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 31fb60e83753b80a5a2eab5a154a87c4 SHA-1: d97dd2934e3cb3948a5f81d7aa919d074750c33d SHA-256: 67d33aba2e5f6ba707661ac7ce915c78a3d2f5c4681df1d7ee5349754e5d217d
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=blue+bloods+book+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_5f9710b4370dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_5f8eb8b287eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8b565cf17fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f8dbc3088280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f8d4aab153e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_5f97431bef4f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5f8df8a8d464c.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/senodiw/bruxismo_nocturno_en_nios.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/mnemonic_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/libro_el_cerebrito.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/10865931469.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/history_of_english_literature_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/building_performance_simulation_for_design_and_operation_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d344b02d-a56d-4011-aa11-158e1b5aa574/liwajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1143af-ac1d-4354-8c31-790542c578d0/25567935262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45417866-1d11-4298-bcd2-eab59a54fe02/54128957567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/krups_savoy_coffee_maker_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7534/6847/files/53551992560.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_off0000671d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671D 4892 bytes
SHA-256: b7377e323e5287b28273d9529c0b48f72617a3660e900a206effb626e4e1f12b
font_01_sfnt_off000077d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D1 12708 bytes
SHA-256: e07649a67099ac76b8b02595284a3ed30ef50ff14c132e0944faa3aa02ecff58

Open this report in the interactive analyzer, or submit your own file for analysis.