Malicious PDF — malware analysis report

Static analysis result for SHA-256 533a9efa2948f802…

MALICIOUS

PDF

39.0 KB Created: 2020-10-27 06:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 17f8d31cce0ecb7f884adebed5418c38 SHA-1: 79608b22fbd5fda3f5283ab52ecc489d7275f0ef SHA-256: 533a9efa2948f8024d072ae5098b3e64e4cfcd7a62badd75489cbcdc371f9e8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/123?keyword=st+lambert+catholic+church+sioux+falls+south+dakota`. The document appears to be part of a link farm designed to drive traffic to potentially malicious sites, masquerading as search results or document downloads.

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://ttraff.ru/123?keyword=st+lambert+catholic+church+sioux+falls+south+dakota In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/dosavawosikut_kozigetow_pujugu_mupivo.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/84033a77b60c8bd.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/80e44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5375/7627/files/xdcc_downloader_premium_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0344/3862/files/magnetism_worksheets_4th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4109/8398/files/hrimaly_scale_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fb0a14-808a-4e1a-bbdc-832b3e748bb1/canterbury_tales_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecea961-f763-4d18-b55d-c1a3b56820de/71845011567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3909d31-84d8-4522-b11d-f0db31051896/68116962646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72f1760-4814-42d3-a585-951493c2522e/gta_san_andreas_castle_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/836b5158-03e2-41fc-919c-4e46e2091203/bolojokalizutuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2530669-050c-415c-808e-8f87051c5f95/vepixigetugawuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10057f2d-37a7-478b-89d2-89b60a1995f3/74982511494.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/16457154099.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/blink_malcolm_gladwell_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/affine_and_projective_geometry_bennett.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/focus_of_sociology_of_law.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/52916989489.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/vujiver.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3728/6815/files/nelebabuxupodimuramuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5937/0904/files/70221930534.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_off000057ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57AE 5636 bytes
SHA-256: 4b720ccf791746723bb9fa0a58bf838a4a8457721923e69b41f8816e24d4a896
font_01_sfnt_off00006aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 10580 bytes
SHA-256: 40c7062e899681a43a70a6491188f3752eb14e64cb0623cffa68d57c5edd779b

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