Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ed1e4db1ca451f…

MALICIOUS

PDF

50.8 KB Created: 2020-10-16 13:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9bbf057cc1542209cf2e9d794fc839bb SHA-1: 615d6b926b582b97ed253eea22efa40d8d3ef160 SHA-256: 97ed1e4db1ca451f610f029a9e02ca04be0f6851d5634c8d2ee71120bd47fd6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting it is the primary lure. The presence of numerous external PDF links, many pointing to benign content, indicates a potential link farm or SEO manipulation tactic to obscure the malicious URL.

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=loup+et+les+7+chevreaux In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8940263e6a4.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/midos-wekixijuv.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/8807337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/226f6505-cb89-425c-9b80-b76a8cc73016/josizusewato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34afee14-a4bd-4030-9f5b-af6e6b8a09da/gavibawozanisagomoziwatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7524979c-aa49-406e-846d-d8a7a7730c0a/remakugimezorugiwemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6facee-5bba-4cc0-951e-48070156d17b/17781617132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85aa6612-5a47-4ad7-a5b6-c56cc1922a6b/41972074746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f592450-ff3b-42df-ae10-598a9c7f92b4/27469740502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f667cea9-42c5-4788-8cb2-26f3624f271f/90309938153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7749/5712/files/secondary_amide_functional_group.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7809/3462/files/ms_equivalent_in_spanish.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0344/7968/files/basket_and_ball_unblocked_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8811/0502/files/buvitivifeketexol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3f31a7-d794-4855-938c-95a07438edea/87010450861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c4c7ca-3369-47cc-81b2-b8f46c2712be/tomijuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671f9c2f-cf7e-4e58-8b27-12861b0a22da/5560510840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ae720b-5d61-4a10-8f69-72292eeb6bdc/golexukowemewigupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb65f138-6da5-4b00-bfc4-7b25e8c5b4b1/89559150339.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FB 4896 bytes
SHA-256: 31a72e9fa02ead1a361d6cba767612d9cdbf70e2ff2fcdaa1d626190ca0cf822
font_01_sfnt_off000088cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88CF 11704 bytes
SHA-256: 51cd2f4bc4bb3c5fd2e5dd14d532f540b54e386997092d63947979c7263f4b33
font_02_sfnt_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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