Malicious PDF — malware analysis report

Static analysis result for SHA-256 67fd685ca9d5b54d…

MALICIOUS

PDF

75.8 KB Created: 2020-10-11 17:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f180339579632b8c4cfc8b8f14bfcb9 SHA-1: f28b1d0f2aa7bbbfc6c636a5ddaff12422021d60 SHA-256: 67fd685ca9d5b54d8ac48dc26d8d797940140d5ea653c5913a67316814654c14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirection attempt. One URL, 'https://cctraff.ru/strik?keyword=hipotesis+de+investigacion+segun+autores', is explicitly flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to research hypotheses and the wkhtmltopdf application, suggesting a lure to disguise the malicious links.

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=hipotesis+de+investigacion+segun+autores In PDF document text
    • http://loxage.floraindianahistory.org/uploads/1/3/2/7/132740836/gubasavejet_vuben_dutonuloj.pdfIn PDF document text
    • http://jigukopuk.elledevisme.com/uploads/1/3/0/7/130739897/jaboxujeworetozusum.pdfIn PDF document text
    • http://redeb.onlinefitnessunderground.com/uploads/1/3/1/3/131380969/aae5e20638b.pdfIn PDF document text
    • http://punewobej.thetonicstudio.com/uploads/1/3/1/3/131380065/riliku.pdfIn PDF document text
    • http://files.neeleysgarden.net/uploads/1/3/0/7/130738894/bibodogipageviju.pdfIn PDF document text
    • http://robavis.absherspropaint.com/uploads/1/3/1/6/131636960/1456054.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/6d105b35-7c26-4750-a017-5da75a557670/zipamexiririrekaketaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc59e04-d443-4cc2-a2b4-6468023b3b5b/takeruwerub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e68243-9836-4568-a2fc-3239384ba56b/jujidulimiwumudirijoxoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98020984-ab0f-4bc2-ba4b-a19dd01e253f/vevolomevinuvenubinaketal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c655f0-0930-46d6-adfb-083493d65833/nuparotubera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6566afa-4112-43dd-8861-8a690193543f/25026498438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/492a280f-bbd8-4725-9fac-d3d24f16c399/rikolorajuvefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2ca3b3-8842-4e48-8bba-c562d13311a6/77201251726.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 5112 bytes
SHA-256: f47cd94be2a5e44b27120e26596249b98b99ed0313cc4ee99f105bfe35b50160
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 12056 bytes
SHA-256: 4171961b9b22f0bd62ccca8b498ed23295651cd780a77f906dcbe0f90c71ad12
font_02_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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