Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a9e88db9389c1d…

MALICIOUS

PDF

35.3 KB Created: 2020-10-02 19:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7da9abb37add8594d3565e5b50fbff2f SHA-1: be5de0eaae1d4ec16b371ae3e2bd0e909c7faa93 SHA-256: f1a9e88db9389c1de0aa49f47e2ec001643f2ace18af53613aaebf08d4139ab0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, includes the same malicious URL and other links that appear to be part of a link farm. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/strik?keyword=new+english+file+intermediate+cd+descargar+gratis In PDF document text
    • http://latodo.galang-kangin.com/uploads/1/3/1/6/131606457/dujelate-jezijiluluzek.pdfIn PDF document text
    • http://files.fairyringschool.org/uploads/1/3/0/7/130775138/rinomesovimap.pdfIn PDF document text
    • http://files.sjdictionarysources.org/uploads/1/3/0/8/130873983/ninarapoxasap-lopeninefo-pawapiwujo.pdfIn PDF document text
    • http://zowuduse.accessabilityfest.com/uploads/1/3/2/6/132681670/zimebupowakafuma.pdfIn PDF document text
    • http://files.bikeforlifesd.org/uploads/1/3/1/4/131453674/gubusejadapumu.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/8844b4ba-8377-4837-a726-a269fb929aec/sesovote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730a9cad-331b-4c61-8d47-619e586836de/97664659567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9021a94-7234-4deb-8545-7aabe4ee4739/25926954734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ccd8ef-d37e-4fed-8613-8c8e9c766d00/75531242836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a05e328-268d-4dc2-b583-e306186ff908/95017218133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/pedaleira_zoom_g2_1u_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/68857921018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5823/3493/files/assigning_oxidation_numbers_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7009/5011/files/car_dolly_straps_near_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0067/4720/files/rububotuvudamixoxojir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d51591-0107-4280-a389-f243b09047a2/83011374715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad2eb11-c577-4fc0-8739-a490311c16b4/mulipikofedifimuradel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa84de2b-b6f4-4b89-81f9-331dfa7c1a4a/98022287927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e528da1c-fd03-4f1f-baf7-f59b86635685/7532338598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97e1e7e-a805-4f5d-aa38-7634c4f06cf0/furodozokejuvuwamumidu.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_off00004b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8B 5496 bytes
SHA-256: 54fb9f2b43cddbd45d99c0c7739b5f7a151f69a7e5cf652f55d7ae28a14feb8a
font_01_sfnt_off00005e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 9896 bytes
SHA-256: 389da0b363ffa206989120a62dd92a6228543e3d2b8ae90fcf38a7c3f167f48b

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