Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aac355beccda4ef…

MALICIOUS

PDF

41.6 KB Created: 2020-10-27 22:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1f97b6fd6789199d1c5c283fce94d0ac SHA-1: 4be36e3efd1e0cf2ddb79161d0dfcddccdea13f2 SHA-256: 5aac355beccda4efbb5eddff706893943aebcf6b4c8f55dc1fea44e0730df9fb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to potentially harmful websites. The ML classifier strongly supports the malicious nature of this PDF.

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://gettraff.ru/strik?keyword=intro+to+limits+worksheet In PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/679953a8556.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1d44b872.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/264334a.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/ximijidajel_kilepozeriz_tupekisimopoman_fejovadopapisog.pdfIn PDF document text
    • https://gezeteweni.weebly.com/uploads/1/3/4/0/134040803/733533.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5f985c9212b79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5f8a71c01fc80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f943f1a5537e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421049/normal_5f970e2258215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8e833a66da8.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/f1197a2f-da22-40a6-8859-64f9e18f2515/concepto_de_manualidades_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73b4652-b27f-489f-bc8d-df8eb0254fce/extraccion_solido_liquido_laboratorio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bdebd5-2071-4238-9f33-9caf42d89918/27401226785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d224f4c2-1fb4-431e-8219-f9c59bb01013/20211475220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fac839-bb7a-4a21-9b9f-b86ea443402e/troy_bilt_tomahawk_chipper_shredder_8hp_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8d5702-f54b-4eaa-bcbd-95af77190eb0/brown_algae_phylogeny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3b5c53-a251-4d00-82da-88410b683de6/15628526861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcaa3ad8-e8b8-404d-83cb-8eda04726996/rules_of_thumb_for_chemical_engineer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da88566-970b-4a85-864c-80b5f3f14f28/nilekobexemagufitafakifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4d699d-b981-4d0b-a84b-3fc7f23e9099/15864093768.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_off00006319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 4808 bytes
SHA-256: a4897e83f04db81cdff9bec9dbe18f236c96add38ef7e9cc6518c7a230e7a03c
font_01_sfnt_off0000734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 11208 bytes
SHA-256: e43f64e9b089743fab5d08f28d5ae89ec4948bad3aa9c0f9cc3a64c9a08d1cf8

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