Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef45c697f8c05a10…

MALICIOUS

PDF

34.7 KB Created: 2020-10-07 06:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b97db3164d654aa95c1f8cf5ff7bd2c1 SHA-1: 791ea5305e79ff62c02fbacc574787313753c6ce SHA-256: ef45c697f8c05a10996bbd83d06f3fe4f23ba3c348a02aba13b5eb1288af1d33
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'Kenmore washer machine repair manual'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/pify?keyword=kenmore+washer+machine+repair+manual In PDF document text
    • http://files.gamedaytraining.net/uploads/1/3/2/6/132681296/sizip.pdfIn PDF document text
    • http://files.theweightlossshow.com/uploads/1/3/1/4/131452872/danokewazidoxesule.pdfIn PDF document text
    • http://xozuzebag.marytherapeuticmassagenb.com/uploads/1/3/1/4/131407921/4597625.pdfIn PDF document text
    • http://vuwomozu.artculturevs.org/uploads/1/3/1/3/131379394/debazemololumobug.pdfIn PDF document text
    • http://files.mcclellandconcretepumping.com/uploads/1/3/1/0/131069839/2297445.pdfIn PDF document text
    • http://wirideba.playbaja.com/uploads/1/3/0/7/130740596/moravusalunazux.pdfIn PDF document text
    • https://site-1036956.mozfiles.com/files/1036956/77648146403.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/wakotasuz.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/61b81c83-0737-42cb-a142-8d083fd76b5a/vitosanevitofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0ac30f-b25f-448d-9255-c917af0117c1/voroselowuvadesed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f3cbf2-4cc0-47c0-9cee-afc01a47fe3c/39551015324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45311bc1-1eaa-4ef2-b34e-f1a9ced0ed8d/54936757137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626d28a3-81a9-4d08-9736-ae85f5f38ee4/63300415489.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_off000049d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49D8 5232 bytes
SHA-256: 88415f813d9404a1be2ef201742ab5de0b9d488ac6d1c614978611d52d81c198
font_01_sfnt_off00005b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8F 10016 bytes
SHA-256: ff269fff9e75c293059afb301570aff184c33e9b98d296c0ce3e89794a429394

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